Unaudited Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) shares in Thousands, $ 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 (in shares) at Dec. 31, 2016					(2,586)
Balance at Dec. 31, 2016	$ 278	$ 411,983	$ 241,207	$ (148,402)	$ (64,580)	$ 9,135	$ 449,621
Net loss			(165,362)				(165,362)
Issuance of common stock and other	11	2,883					2,894
Treasury stock (in shares)					310
Deferred compensation plan (in shares)					(415)
Treasury stock					$ 14,561		14,561
Deferred compensation plan		(14,469)			(129)	129	(14,469)
Stock compensation tax adjustment			5,930				5,930
Translation adjustment				22,791			22,791
Balance at Jun. 30, 2017	$ 289	$ 400,397	$ 81,775	$ (125,611)	$ (50,148)	$ 9,264	$ 315,966
Balance (in shares) at Jun. 30, 2017					(2,691)