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	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, 2018			$ 450	$ 71,596	$ 846,721	$ 1,958	$ 63,427	$ 0	$ 63,427	$ (35,705)	$ (886,084)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			17		37,925
Restricted stock units recognized, net of forfeitures				21,674
Restricted stock units delivered				(36,359)
Exchangeable shares of subsidiary delivered						(1,958)
Dividends							(2,699)
Net income (loss)	$ (28,083)						(28,083)
Currency translation adjustment, net of tax										(272)
Repurchased		$ (13,100)									(29,780)
Ending Balance at Jun. 30, 2019	$ 22,828		467	56,911	884,646	0	32,645			(35,977)	(915,864)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning Balance at Dec. 31, 2018			450	71,596	846,721	1,958	63,427	0	63,427	(35,705)	(886,084)
Ending Balance at Dec. 31, 2019	$ 44,675		468	77,657	887,095	0	69,093	(123)	68,970	(34,115)	(955,523)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Mar. 31, 2019			462	47,214	880,924	1,958	46,695	0	46,695	(34,651)	(910,485)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			5		3,722
Restricted stock units recognized, net of forfeitures				11,656
Restricted stock units delivered				(1,959)
Exchangeable shares of subsidiary delivered						(1,958)
Dividends							(1,353)
Net income (loss)	$ (12,697)						(12,697)
Currency translation adjustment, net of tax										(1,326)
Repurchased											(5,379)
Ending Balance at Jun. 30, 2019	22,828		467	56,911	884,646	0	32,645			(35,977)	(915,864)
Beginning Balance at Dec. 31, 2019	44,675		468	77,657	887,095	0	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)
Exchangeable shares of subsidiary delivered						0
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	0	43,881			(38,325)	(978,145)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Mar. 31, 2020			483	47,430	927,686	0	60,202	$ 0	$ 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)
Exchangeable shares of subsidiary delivered						0
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	$ 0	$ 43,881			$ (38,325)	$ (978,145)