Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
BALANCE at Dec. 31, 2012	$ 91	$ (44,214)	$ 307,823	$ 334,012	$ 19,688	$ 617,400
BALANCE (in shares) at Dec. 31, 2012	88,663	2,384
Amortization of stock compensation			14,483			14,483
Forfeitures			(2,014)			(2,014)
Forfeitures (in shares)	(78)
Exercises of stock options and issuance of restricted stock awards	$ 1	$ 1,039	1,240			2,280
Exercises of stock options and issuance of restricted stock awards (in shares)	715	(22)
Repurchase of common stock for tax withholding		$ (256)				(256)
Repurchase of common stock for tax withholding (in shares)	(16)	16
Purchase of treasury stock		$ (12,533)				(12,533)
Purchase of treasury stock (in shares)	(834)	834
Net income (loss)				10,420		10,420
Foreign currency translation, net of tax					(5,335)	(5,335)
Reclassification of cumulative foreign exchange translation adjustments to net income					299	299
BALANCE at Dec. 31, 2013	$ 92	$ (55,964)	321,532	344,432	14,652	624,744
BALANCE (in shares) at Dec. 31, 2013	88,450	3,212
Amortization of stock compensation			14,896			14,896
Forfeitures			(2,129)			(2,129)
Forfeitures (in shares)	(144)
Exercises of stock options and issuance of restricted stock awards		$ 2,185	(843)			1,342
Exercises of stock options and issuance of restricted stock awards (in shares)	853	(46)
Repurchase of common stock for tax withholding		$ (787)				(787)
Repurchase of common stock for tax withholding (in shares)	(53)	53
Purchase of treasury stock		$ (145,858)				(145,858)
Purchase of treasury stock (in shares)	(10,590)	10,590
Dividend - Series A preferred stock				(11,301)		(11,301)
Accretion - Series A preferred stock				(2,735)		(2,735)
Adjustment for beneficial conversion feature of Series A preferred stock			12,276			12,276
Net income (loss)				(4,926)		(4,926)
Foreign currency translation, net of tax					(33,004)	(33,004)
BALANCE at Dec. 31, 2014	$ 92	$ (200,424)	345,732	325,470	(18,352)	452,518
BALANCE (in shares) at Dec. 31, 2014	78,516	13,809
Amortization of stock compensation			13,094			13,094
Forfeitures			(1,908)			(1,908)
Tax shortfall from share-based plans			(2,841)			(2,841)
Exercises of stock options and issuance of restricted stock awards	$ 2	$ 2,698	(836)			1,864
Exercises of stock options and issuance of restricted stock awards (in shares)	832	(56)
Repurchase of common stock for tax withholding		$ (261)				(261)
Repurchase of common stock for tax withholding (in shares)	(22)	22
Purchase of treasury stock		$ (85,926)				(85,926)
Purchase of treasury stock (in shares)	(6,475)	6,475
Dividend - Series A preferred stock				(11,833)		(11,833)
Accretion - Series A preferred stock				(2,978)		(2,978)
Net income (loss)				(83,196)		(83,196)
Foreign currency translation, net of tax					(32,561)	(32,561)
BALANCE at Dec. 31, 2015	$ 94	$ (283,913)	$ 353,241	$ 227,463	$ (50,913)	$ 245,972
BALANCE (in shares) at Dec. 31, 2015	72,851	20,250