Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information - Condensed Consolidating Statements of Comprehensive Income (Loss) (Details)

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Condensed Consolidating Financial Information - Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items]        
Net income $ 6,920 $ 40,527 $ 137,330 $ 128,914
Foreign currency translation adjustment (9,536) 3,894 (9,998) (5,786)
Change in fair value of derivative instruments, net of taxes 0 [1] 630 [1] 0 [1] (444) [1]
Reclassification of settled contracts, net of taxes 0 [2] 1,617 [2] 0 [2] 4,818 [2]
Other comprehensive (loss) income (9,536) 6,141 (9,998) (1,412)
Comprehensive (loss) income (2,616) 46,668 127,332 127,502
Parent Company [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income 6,920 40,527 137,330 128,914
Foreign currency translation adjustment (9,536) 3,894 (9,998) (5,786)
Change in fair value of derivative instruments, net of taxes   630   (444)
Reclassification of settled contracts, net of taxes   1,617   4,818
Other comprehensive (loss) income (9,536) 6,141 (9,998) (1,412)
Comprehensive (loss) income (2,616) 46,668 127,332 127,502
Guarantor [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income 156 179 397 456
Foreign currency translation adjustment 0 0 0 0
Change in fair value of derivative instruments, net of taxes   0   0
Reclassification of settled contracts, net of taxes   0   0
Other comprehensive (loss) income 0 0 0 0
Comprehensive (loss) income 156 179 397 456
Non-Guarantor [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income (4,634) (862) (8,860) (2,127)
Foreign currency translation adjustment (9,536) 3,894 (9,998) (5,786)
Change in fair value of derivative instruments, net of taxes   0   0
Reclassification of settled contracts, net of taxes   0   0
Other comprehensive (loss) income (9,536) 3,894 (9,998) (5,786)
Comprehensive (loss) income (14,170) 3,032 (18,858) (7,913)
Eliminations [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income 4,478 683 8,463 1,671
Foreign currency translation adjustment 9,536 (3,894) 9,998 5,786
Change in fair value of derivative instruments, net of taxes   0   0
Reclassification of settled contracts, net of taxes   0   0
Other comprehensive (loss) income 9,536 (3,894) 9,998 5,786
Comprehensive (loss) income $ 14,014 $ (3,211) $ 18,461 $ 7,457
[1] Net of $0.4 million and $(0.3) million in taxes for the three and nine months ended September 30, 2013, respectively. No taxes were recorded in the three and nine months ended September 30, 2014.
[2] Net of $1.0 million and $3.0 million in taxes for the three and nine months ended September 30, 2013, respectively. No taxes were recorded in the three and nine months ended September 30, 2014.