Condensed Consolidated Statements of Changes in Stockholders' Equity - 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	Exchangeable shares of subsidiary	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock, at cost, par value $0.01 per share
Beginning Balance at Dec. 31, 2018			$ 450	$ 71,596	$ 846,721	$ 1,958	$ 63,427	$ (35,705)	$ (886,084)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued			12		34,203
Restricted stock units recognized, net of forfeitures				10,018
Restricted stock units delivered				(34,400)
Exchangeable shares of subsidiary delivered						0
Dividends							(1,346)
Net income (loss)	$ (15,386)						(15,386)
Currency translation adjustment, net of tax								1,054
Repurchased		$ (12,700)							(24,401)
Ending Balance at Mar. 31, 2019	32,117		462	47,214	880,924	1,958	46,695	(34,651)	(910,485)
Beginning Balance at Dec. 31, 2019	44,675		468	77,657	887,095	0	69,093	(34,115)	(955,523)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued			15		40,591
Restricted stock units recognized, net of forfeitures				10,307
Restricted stock units delivered				(40,534)
Exchangeable shares of subsidiary delivered						0
Dividends							(1,195)
Net income (loss)	(7,573)						(7,573)
Currency translation adjustment, net of tax								(14,032)
Repurchased		$ (13,600)							(22,056)
Ending Balance at Mar. 31, 2020	$ 10,075		$ 483	$ 47,430	$ 927,686	$ 0	$ 60,202	$ (48,147)	$ (977,579)