Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Deferred Compensation Expense [Member]	Total
Balance at Dec. 31, 2013	$ 269	$ 402,286	$ 623,221	$ 49,965	$ (18,690)	$ 6,290	$ 1,063,341
Balance (in shares) at Dec. 31, 2013					(549)
Net income (loss)			62,375				62,375
Issuance of common stock	2	8,190					8,192
Deferred compensation plan		165			$ (1,254)	1,254	165
Deferred compensation plan (in shares)					(37)
Stock repurchases (in shares)					(1,898)
Stock repurchases					$ (58,497)		(58,497)
Cash dividends declared and paid			(26,193)				(26,193)
Translation adjustment				(80,630)			(80,630)
Balance at Dec. 31, 2014	271	410,641	659,403	(30,665)	$ (78,441)	7,544	968,753
Balance (in shares) at Dec. 31, 2014					(2,484)
Cash dividends declared and paid			26,193				26,193
Net income (loss)			(215,235)				(215,235)
Issuance of common stock	3	9,890					9,893
Deferred compensation plan		(3,242)			$ (1,176)	1,176	(3,242)
Deferred compensation plan (in shares)					(104)
Translation adjustment				(65,569)			(65,569)
Balance at Dec. 31, 2015	274	417,289	444,181	(96,234)	$ (75,922)	8,720	698,308
Balance (in shares) at Dec. 31, 2015					(2,543)
Treasury stock activity (net) (in shares)					45
Treasury stock activity (net)					$ 3,695		3,695
Forfeiture of dividends			13				13
Net income (loss)			(202,979)				(202,979)
Issuance of common stock	4	6,265					6,269
Deferred compensation plan		(11,571)			$ (415)	415	(11,571)
Deferred compensation plan (in shares)					(263)
Cash dividends declared and paid			(5)				(5)
Translation adjustment				(52,168)			(52,168)
Balance at Dec. 31, 2016	$ 278	$ 411,983	241,207	$ (148,402)	$ (64,580)	$ 9,135	449,621
Balance (in shares) at Dec. 31, 2016					(2,586)
Treasury stock activity (net) (in shares)					220
Treasury stock activity (net)					$ 11,757		11,757
Cash dividends declared and paid			$ 5				$ 5