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			17		46,220
Restricted stock units recognized, net of forfeitures				20,833
Restricted stock units delivered				(46,233)
Dividends						(2,548)
Net income (loss)	$ (22,541)					(22,541)
Currency translation adjustment, net of tax									(4,210)
Repurchased		$ (14,200)								(22,622)
Ending Balance at Jun. 30, 2020	13,468		485	52,257	933,315	43,881			(38,325)	(978,145)
Beginning Balance at Mar. 31, 2020			483	47,430	927,686	60,202		60,202	(48,147)	(977,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			2		5,629
Restricted stock units recognized, net of forfeitures				10,526
Restricted stock units delivered				(5,699)
Dividends						(1,353)
Net income (loss)	(14,968)					(14,968)
Currency translation adjustment, net of tax									9,822
Repurchased										(566)
Ending Balance at Jun. 30, 2020	13,468		485	52,257	933,315	43,881			(38,325)	(978,145)
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			18		29,458
Restricted stock units recognized, net of forfeitures				15,039
Restricted stock units delivered				(30,320)
Dividends						(2,569)
Net income (loss)	(6,741)					(6,741)
Currency translation adjustment, net of tax									(1,153)
Repurchased		$ (11,300)								(23,843)
Ending Balance at Jun. 30, 2021	67,956		505	44,131	966,483	86,114			(26,654)	(1,002,623)
Beginning Balance at Mar. 31, 2021			502	41,325	962,651	96,192		$ 96,192	(26,052)	(993,324)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			3		3,832
Restricted stock units recognized, net of forfeitures				6,693
Restricted stock units delivered				(3,887)
Dividends						(1,253)
Net income (loss)	(8,825)					(8,825)
Currency translation adjustment, net of tax									(602)
Repurchased										(9,299)
Ending Balance at Jun. 30, 2021	$ 67,956		$ 505	$ 44,131	$ 966,483	$ 86,114			$ (26,654)	$ (1,002,623)