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Condensed Consolidating Financial Information (Condensed Consolidating Statements of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 90,090	$ 154,455
Foreign currency translation adjustment	(5,503)	1,373
Other comprehensive (loss) income	(5,503)	1,373
Comprehensive income	84,587	155,828
Reportable Legal Entities | Parent
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	90,090	154,455
Foreign currency translation adjustment	(5,503)	1,373
Other comprehensive (loss) income	(5,503)	1,373
Comprehensive income	84,587	155,828
Reportable Legal Entities | Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	86,686	45,881
Foreign currency translation adjustment	(187)	55
Other comprehensive (loss) income	(187)	55
Comprehensive income	86,499	45,936
Reportable Legal Entities | Non-Guarantor
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(331)	(366)
Foreign currency translation adjustment	(5,316)	1,318
Other comprehensive (loss) income	(5,316)	1,318
Comprehensive income	(5,647)	952
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(86,355)	(45,515)
Foreign currency translation adjustment	5,503	(1,373)
Other comprehensive (loss) income	5,503	(1,373)
Comprehensive income	$ (80,852)	$ (46,888)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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