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Condensed Consolidating Statement Of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Condensed Statement of Income Captions [Line Items]        
Net income (loss) $ 47,595 $ 47,565 $ 121,334 $ 107,550
Other comprehensive income, net of tax:        
Amortization of loss on cash flow hedge 215 215 646 646
Foreign currency translation adjustment 851 137 2,842 1,036
Other comprehensive income, net of tax 1,066 352 3,488 1,682
Comprehensive income 48,661 47,917 124,822 109,232
Parent        
Condensed Statement of Income Captions [Line Items]        
Net income (loss) 47,595 47,565 121,334 107,550
Other comprehensive income, net of tax:        
Amortization of loss on cash flow hedge 215 215 646 646
Foreign currency translation adjustment 851 137 2,842 1,036
Other comprehensive income, net of tax 1,066 352 3,488 1,682
Comprehensive income 48,661 47,917 124,822 109,232
Guarantor Subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net income (loss) 10,130 3,356 16,816 12,408
Other comprehensive income, net of tax:        
Amortization of loss on cash flow hedge 0 0 0 0
Foreign currency translation adjustment 0 0 0 0
Other comprehensive income, net of tax 0 0 0 0
Comprehensive income 10,130 3,356 16,816 12,408
Non-Guarantor Subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net income (loss) 9,726 10,358 23,630 23,236
Other comprehensive income, net of tax:        
Amortization of loss on cash flow hedge 0 0 0 0
Foreign currency translation adjustment 851 137 2,842 1,036
Other comprehensive income, net of tax 851 137 2,842 1,036
Comprehensive income 10,577 10,495 26,472 24,272
Eliminations        
Condensed Statement of Income Captions [Line Items]        
Net income (loss) (19,856) (13,714) (40,446) (35,644)
Other comprehensive income, net of tax:        
Amortization of loss on cash flow hedge 0 0 0 0
Foreign currency translation adjustment (851) (137) (2,842) (1,036)
Other comprehensive income, net of tax (851) (137) (2,842) (1,036)
Comprehensive income $ (20,707) $ (13,851) $ (43,288) $ (36,680)