Supplemental Guarantors Consolidating Condensed Financial Information - (Statement of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 4,118	$ (5,443)	$ (9,235)	$ (13,864)	$ (96,013)	$ (4,055)	$ (2,276)	$ (7,646)	$ (24,424)	$ (109,990)	$ 9,678
Foreign currency translation adjustments									3,190	(21,211)	(12,081)
Comprehensive income (loss)									(21,234)	(131,201)	(2,403)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									(496)	84,762	(18,449)
Foreign currency translation adjustments									85	138	15
Comprehensive income (loss)									(411)	84,900	(18,434)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									(24,424)	(109,990)	9,678
Foreign currency translation adjustments									0	0	0
Comprehensive income (loss)									(24,424)	(109,990)	9,678
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									(486)	(76,908)	23,901
Foreign currency translation adjustments									0	0	0
Comprehensive income (loss)									(486)	(76,908)	23,901
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									982	(7,854)	(5,452)
Foreign currency translation adjustments									3,105	(21,349)	(12,096)
Comprehensive income (loss)									$ 4,087	$ (29,203)	$ (17,548)