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Acquisitions of ITS - Narrative (Details) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | |||||||||||||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Term Loan [Member]
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Dec. 31, 2012
Term Loan [Member]
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Dec. 31, 2013
7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member]
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Jul. 30, 2013
7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member]
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Dec. 31, 2012
7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member]
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Jul. 30, 2013
ITS [Member]
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Apr. 22, 2013
ITS [Member]
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Dec. 31, 2013
ITS [Member]
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Dec. 31, 2013
ITS [Member]
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Dec. 31, 2013
ITS [Member]
Term Loan [Member]
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Sep. 30, 2013
ITS [Member]
7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member]
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Jul. 30, 2013
ITS [Member]
7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member]
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Dec. 31, 2013
ITS [Member]
Accounts Receivable [Member]
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| Business Acquisition [Line Items] | ||||||||||||||||||||||||
| Cash paid to, or on behalf of, ITS and its equity holders | $ 101,000,000 | |||||||||||||||||||||||
| Cash paid for acquisition | 24,000,000 | |||||||||||||||||||||||
| Amount released from escrow funds | 5,000,000 | 5,000,000 | ||||||||||||||||||||||
| Fair value of contingent consideration deposited in escrow for assets not acquired | 5,000,000 | |||||||||||||||||||||||
| Assets, Fair Value Disclosure | 0 | |||||||||||||||||||||||
| Debt issuance costs | 5,400,000 | |||||||||||||||||||||||
| Long-term Debt | 653,781,000 | 479,205,000 | 653,781,000 | 479,205,000 | 0 | 50,000,000 | 225,000,000 | 0 | 125,000,000 | |||||||||||||||
| Proceeds from issuance of term note | 225,000,000 | |||||||||||||||||||||||
| Acquisition related costs | 22,500,000 | |||||||||||||||||||||||
| Debt instrument fixed interest rate | 7.50% | 7.50% | 7.50% | |||||||||||||||||||||
| Deferred acquisition costs | 5,200,000 | |||||||||||||||||||||||
| Revenues | 243,321,000 | 237,762,000 | 225,954,000 | 167,135,000 | 157,171,000 | 165,200,000 | 178,895,000 | 176,495,000 | 874,172,000 | 677,761,000 | 686,234,000 | 88,000,000 | ||||||||||||
| Net income | $ 27,179,000 | $ 37,098,000 | $ (50,645,000) | $ 10,000,000 | ||||||||||||||||||||