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Long-Term Debt (Details Textual) (USD $)
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6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||||
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Jun. 30, 2012
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Jun. 30, 2012
Revolving Credit Facility [Member]
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Dec. 31, 2011
Revolving Credit Facility [Member]
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Apr. 30, 2011
Secured Debt [Member]
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May 31, 2008
Secured Debt [Member]
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Mar. 31, 2011
Secured Debt [Member]
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May 15, 2008
Secured Debt [Member]
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Jun. 30, 2012
9.125% Senior Notes, due April 2018 (issued March 22,2010) [Member]
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Apr. 01, 2014
9.125% Senior Notes, due April 2018 (issued March 22,2010) [Member]
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Apr. 01, 2013
9.125% Senior Notes, due April 2018 (issued March 22,2010) [Member]
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Mar. 22, 2010
9.125% Senior Notes, due April 2018 (issued March 22,2010) [Member]
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Apr. 30, 2012
9.125% Senior Notes, due April 2018 (issued April 25,2012) [Member]
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Apr. 25, 2012
9.125% Senior Notes, due April 2018 (issued April 25,2012) [Member]
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May 31, 2012
2.125% Convertible Senior Notes [Member]
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Jun. 30, 2012
2.125% Convertible Senior Notes [Member]
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Jun. 30, 2012
2.125% Convertible Senior Notes [Member]
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Jul. 15, 2012
2.125% Convertible Senior Notes [Member]
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May 09, 2012
2.125% Convertible Senior Notes [Member]
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Jul. 05, 2007
2.125% Convertible Senior Notes [Member]
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Jun. 30, 2012
2.125% Convertible Senior Notes [Member]
Repayment of Debt [Member]
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Jun. 30, 2012
Term Note [Member]
Secured Debt [Member]
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Jun. 30, 2012
Term Note [Member]
Secured Debt [Member]
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Dec. 31, 2011
Term Note [Member]
Secured Debt [Member]
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May 15, 2008
Term Note [Member]
Secured Debt [Member]
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Jun. 30, 2012
Senior Notes One [Member]
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Jun. 30, 2012
Line of Credit [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||
| Percentage of notes guaranteed by restricted subsidiaries | 9.125% | 2.125% | 9.625% | |||||||||||||||||||||||
| Aggregate principal amount additional issued | $ 300,000,000 | $ 125,000,000 | $ 125,000,000 | |||||||||||||||||||||||
| Par value of senior notes | 104.00% | |||||||||||||||||||||||||
| Gross proceeds of aggregate principal amount additional issued | 130,000,000 | |||||||||||||||||||||||||
| Tender offer price for each 1000 principal amount of 2.125% notes | 1,003.27 | |||||||||||||||||||||||||
| Unit for which the tender offer price of 2.125% notes is calculated | 1,000 | |||||||||||||||||||||||||
| Repayments of debt | 225,000,000 | 42,000,000 | ||||||||||||||||||||||||
| Number of common shares under call options | 9,027,713 | 9,027,713 | ||||||||||||||||||||||||
| Strike price of common stock shares | $ 18.29 | |||||||||||||||||||||||||
| Debt issuance costs | 3,600,000 | |||||||||||||||||||||||||
| Amortization period of the debt issuance cost | 5 years | |||||||||||||||||||||||||
| One time debt extinguishment cost | 1,600,000 | |||||||||||||||||||||||||
| Notes paid off | 2,100,000 | |||||||||||||||||||||||||
| Repurchase of convertible senior notes | 122,900,000 | |||||||||||||||||||||||||
| Percentage of the aggregate principal amount redeemed | 35.00% | |||||||||||||||||||||||||
| Percentage of redemption price before notice | 109.125% | |||||||||||||||||||||||||
| Percentage of redemption price after notice | 104.563% | |||||||||||||||||||||||||
| Percentage of repurchase | 101.00% | |||||||||||||||||||||||||
| Senior secured credit facility | 80,000,000 | 50,000,000 | ||||||||||||||||||||||||
| Increase in the amount of term loan or revolving credit facility | 50,000,000 | |||||||||||||||||||||||||
| Increase in aggregate commitments under credit agreements | 159,000,000 | 180,000,000 | ||||||||||||||||||||||||
| Additional borrowings under term loan | 50,000,000 | |||||||||||||||||||||||||
| Maturity of credit facility | May 14, 2013 | |||||||||||||||||||||||||
| Term Loan borrowed under credit facility | 49,000,000 | 49,000,000 | ||||||||||||||||||||||||
| Variation in applicable rate for LIBOR Rate Loan, Minimum | 2.75% | |||||||||||||||||||||||||
| Balance of term loan to be repaid | 31,000,000 | 31,000,000 | ||||||||||||||||||||||||
| Libor plus | 3.25% | |||||||||||||||||||||||||
| Variation in applicable rate for Base Rate Loan, Minimum | 1.75% | |||||||||||||||||||||||||
| Base rate plus | 2.25% | |||||||||||||||||||||||||
| Revolving loans Outstanding | 0 | 0 | 49,000,000 | 49,000,000 | 61,000,000 | |||||||||||||||||||||
| Amortization Term loan | 6,000,000 | |||||||||||||||||||||||||
| Repayment of Revolver term loan outstanding | 25,000,000 | |||||||||||||||||||||||||
| Letters of credit outstanding | $ 2,600,000 | $ 2,700,000 | ||||||||||||||||||||||||
| Variation in applicable rate for LIBOR Rate Loan, Maximum | 3.25% | |||||||||||||||||||||||||
| Variation in applicable rate for Base Rate Loan, Maximum | 2.25% | |||||||||||||||||||||||||
| Long-Term Debt (Textual) [Abstract] | ||||||||||||||||||||||||||
| Number of business days ratable expiration for warrants | 90 days | |||||||||||||||||||||||||