Condensed Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Restricted Stock Units	Common stock, par value $0.01 per share	Restricted stock units Restricted Stock Units	Additional paid-in capital	Retained earnings	Retained earnings Cumulative effect of the change in accounting principle related to credit losses	Retained earnings Retained earnings, beginning of the period, as adjusted	Accumulated other comprehensive income (loss)	Treasury stock, at cost, par value $0.01 per share
Beginning Balance at Dec. 31, 2019			$ 468	$ 77,657	$ 887,095	$ 69,093	$ (123)	$ 68,970	$ (34,115)	$ (955,523)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			18		48,805
Restricted stock units recognized, net of forfeitures				28,013
Restricted stock units delivered				(49,099)
Dividends						(3,859)
Net income (loss)	$ (31,916)					(31,916)
Currency translation adjustment, net of tax									(50)
Repurchased		$ (14,600)								(23,044)
Ending Balance at Sep. 30, 2020	13,420		486	56,571	935,900	33,195			(34,165)	(978,567)
Beginning Balance at Jun. 30, 2020			485	52,257	933,315	43,881		43,881	(38,325)	(978,145)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			1		2,585
Restricted stock units recognized, net of forfeitures				7,180
Restricted stock units delivered				(2,866)
Dividends						(1,311)
Net income (loss)	(9,375)					(9,375)
Currency translation adjustment, net of tax									4,160
Repurchased										(422)
Ending Balance at Sep. 30, 2020	13,420		486	56,571	935,900	33,195			(34,165)	(978,567)
Beginning Balance at Dec. 31, 2020	88,067		487	59,412	937,025	95,424		95,424	(25,501)	(978,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			19		31,624
Restricted stock units recognized, net of forfeitures				22,535
Restricted stock units delivered				(32,501)
Dividends						(3,869)
Net income (loss)	13,403					13,403
Currency translation adjustment, net of tax									(5,188)
Repurchased		$ (11,900)								(33,370)
Ending Balance at Sep. 30, 2021	80,720		506	49,446	968,649	104,958			(30,689)	(1,012,150)
Beginning Balance at Jun. 30, 2021			505	44,131	966,483	86,114		$ 86,114	(26,654)	(1,002,623)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			1		2,166
Restricted stock units recognized, net of forfeitures				7,496
Restricted stock units delivered				(2,181)
Dividends						(1,300)
Net income (loss)	20,144					20,144
Currency translation adjustment, net of tax									(4,035)
Repurchased										(9,527)
Ending Balance at Sep. 30, 2021	$ 80,720		$ 506	$ 49,446	$ 968,649	$ 104,958			$ (30,689)	$ (1,012,150)