Supplemental Guarantors Consolidating Condensed Financial Information (Statement of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions
Net income (loss)	$ (9,636)	$ (9,235)	$ (23,015)	$ (23,099)
Foreign currency translation adjustments	2,569	(308)	3,391	6,436
Comprehensive income (loss)	(7,067)	(9,543)	(19,624)	(16,663)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions
Net income (loss)	3,398	1,018	10,918	13,892
Foreign currency translation adjustments	0	0	111	83
Comprehensive income (loss)	3,398	1,018	11,029	13,975
Parent [Member]
Condensed Financial Statements, Captions
Net income (loss)	(9,636)	(9,235)	(23,015)	(23,099)
Foreign currency translation adjustments	0	0	0	0
Comprehensive income (loss)	(9,636)	(9,235)	(23,015)	(23,099)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions
Net income (loss)	(3,472)	(3,256)	(10,867)	(11,249)
Foreign currency translation adjustments	0	0	0	0
Comprehensive income (loss)	(3,472)	(3,256)	(10,867)	(11,249)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions
Net income (loss)	74	2,238	(51)	(2,643)
Foreign currency translation adjustments	2,569	(308)	3,280	6,353
Comprehensive income (loss)	$ 2,643	$ 1,930	$ 3,229	$ 3,710