Quarterly report pursuant to Section 13 or 15(d)

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details)

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Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income $ 8,281 $ 20,083 $ 8,873 $ 46,475
Foreign exchange translation losses and other (564) 0 (564) 0
Total other comprehensive loss, net of tax: (564) 0 (564) 0
Comprehensive income 7,717 20,083 8,309 46,475
Comprehensive (income)/loss attributable to noncontrolling interest (30) 0 (30) 0
Comprehensive income attributable to controlling interest 7,687 20,083 8,279 46,475
Parent [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 8,281 20,083 8,873 46,475
Foreign exchange translation losses and other 0   0  
Total other comprehensive loss, net of tax: 0   0  
Comprehensive income 8,281   8,873  
Comprehensive (income)/loss attributable to noncontrolling interest 0   0  
Comprehensive income attributable to controlling interest 8,281   8,873  
Guarantor [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 6,635 25,446 16,794 46,811
Foreign exchange translation losses and other 0   0  
Total other comprehensive loss, net of tax: 0   0  
Comprehensive income 6,635   16,794  
Comprehensive (income)/loss attributable to noncontrolling interest 0   0  
Comprehensive income attributable to controlling interest 6,635   16,794  
Non-Guarantor [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 7,193 37,719 (2,787) 48,254
Foreign exchange translation losses and other (564)   (564)  
Total other comprehensive loss, net of tax: (564)   (564)  
Comprehensive income 6,629   (3,351)  
Comprehensive (income)/loss attributable to noncontrolling interest (30)   (30)  
Comprehensive income attributable to controlling interest 6,599   (3,381)  
Eliminations [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (13,828) (63,165) (14,007) (95,065)
Foreign exchange translation losses and other 0   0  
Total other comprehensive loss, net of tax: 0   0  
Comprehensive income (13,828)   (14,007)  
Comprehensive (income)/loss attributable to noncontrolling interest 0   0  
Comprehensive income attributable to controlling interest $ (13,828)   $ (14,007)