Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Restricted stock units	Common stock	Restricted stock units Restricted stock units	Additional paid-in capital	Exchangeable shares of subsidiary	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of the change in accounting principle related to revenue recognition | Accounting Standards Update 2014-09							$ 0
Retained earnings, beginning of the period, as adjusted							111,798
Beginning Balance at Dec. 31, 2016			$ 414	$ 85,907	$ 734,728	$ 1,958	111,798	$ (32,398)	$ (611,224)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			24		65,231
Restricted stock units recognized, net of forfeitures				40,597
Restricted stock units delivered				(45,992)
Tax effect of issuance of contingent equity earnout					0
Tax benefit from the delivery of restricted stock units					847
Exchangeable shares of subsidiary delivered						0
Dividends							(47,552)
Net income (loss)	$ (26,651)						(26,651)
Currency translation adjustment, net of tax	10,176							10,176
Repurchased									(79,561)
Ending Balance at Dec. 31, 2017			438	80,512	800,806	1,958	37,595	(22,222)	(690,785)	$ 208,302
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of the change in accounting principle related to revenue recognition | Accounting Standards Update 2014-09							(7,645)
Retained earnings, beginning of the period, as adjusted							29,950
Common stock issued			12		45,915
Restricted stock units recognized, net of forfeitures				37,941
Restricted stock units delivered				(46,857)
Tax effect of issuance of contingent equity earnout					0
Tax benefit from the delivery of restricted stock units					0
Exchangeable shares of subsidiary delivered						0
Dividends							(5,745)
Net income (loss)	39,222						39,222
Currency translation adjustment, net of tax	(13,483)							(13,483)
Repurchased		$ (8,700)							(195,299)
Ending Balance at Dec. 31, 2018	62,363		450	71,596	846,721	1,958	63,427	(35,705)	(886,084)	62,363
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of the change in accounting principle related to revenue recognition | Accounting Standards Update 2014-09							0
Retained earnings, beginning of the period, as adjusted							63,427
Common stock issued			18		41,582
Restricted stock units recognized, net of forfeitures				46,382
Restricted stock units delivered				(40,321)
Tax effect of issuance of contingent equity earnout					(1,208)
Tax benefit from the delivery of restricted stock units					0
Exchangeable shares of subsidiary delivered						(1,958)
Dividends							(5,312)
Net income (loss)	10,978						10,978
Currency translation adjustment, net of tax	1,590							1,590
Repurchased		$ (14,000)							(69,439)
Ending Balance at Dec. 31, 2019	$ 44,675		$ 468	$ 77,657	$ 887,095	$ 0	$ 69,093	$ (34,115)	$ (955,523)	$ 44,675