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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]        
Net income $ 40,527 $ 502 $ 128,914 $ 52,488
Foreign currency translation adjustment 3,894 5,320 (5,786) 3,394
Change in fair value of derivative instruments, net of taxes 630 [1] (19,251) [1] (444) [1] (11,678) [1]
Reclassification of settled contracts, net of taxes 1,617 [2] 185 [2] 4,818 [2] 646 [2]
Other comprehensive income (loss) 6,141 (13,746) (1,412) (7,638)
Comprehensive income 46,668 (13,244) 127,502 44,850
Parent [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income 40,527 502 128,914 52,488
Foreign currency translation adjustment 3,894 5,320 (5,786) 3,394
Change in fair value of derivative instruments, net of taxes 630 (19,251) (444) (11,678)
Reclassification of settled contracts, net of taxes 1,617 185 4,818 646
Other comprehensive income (loss) 6,141 (13,746) (1,412) (7,638)
Comprehensive income 46,668 (13,244) 127,502 44,850
Guarantor [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income 179 31 456 276
Foreign currency translation adjustment 0 0 0 0
Change in fair value of derivative instruments, net of taxes 0 0 0 0
Reclassification of settled contracts, net of taxes 0 0 0 0
Other comprehensive income (loss) 0 0 0 0
Comprehensive income 179 31 456 276
Non-Guarantor [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income (862) (280) (2,127) (890)
Foreign currency translation adjustment 3,894 5,320 (5,786) 3,394
Change in fair value of derivative instruments, net of taxes 0 0 0 0
Reclassification of settled contracts, net of taxes 0 0 0 0
Other comprehensive income (loss) 3,894 5,320 (5,786) 3,394
Comprehensive income 3,032 5,040 (7,913) 2,504
Eliminations [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income 683 249 1,671 614
Foreign currency translation adjustment (3,894) (5,320) 5,786 (3,394)
Change in fair value of derivative instruments, net of taxes 0 0 0 0
Reclassification of settled contracts, net of taxes 0 0 0 0
Other comprehensive income (loss) (3,894) (5,320) 5,786 (3,394)
Comprehensive income $ (3,211) $ (5,071) $ 7,457 $ (2,780)
[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, 2012.
[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, 2012.