Unaudited Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Total	Accumulated Other Comprehensive Income (Loss) [Member]	Additional Paid-in Capital [Member]	Common Stock [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Deferred Compensation Expense [Member]
Balance, at Dec. 31, 2014	$ 968,753	$ (30,665)	$ 410,641	$ 271	$ 659,403	$ (78,441)	$ 7,544
Balance, (in shares) at Dec. 31, 2014						(2,484)
Net income (loss)	(5,126)				(5,126)
Issuance of common stock and other	3,057		3,056	1
Deferred compensation plan	(793)		(793)			(659)	659
Deferred compensation plan (in shares)						(42)
Stock repurchases (in shares)						(5)
Stock repurchases	958					958
Foreign currency gain (loss)	(43,667)	(43,667)
Balance, at Mar. 31, 2015	$ 923,182	$ (74,332)	$ 412,904	$ 272	$ 654,277	$ (78,142)	$ 8,203
Balance, (in shares) at Mar. 31, 2015						(2,521)