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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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of the change in accounting principle related to revenue recognition             $ (7,645)    
Retained earnings, beginning of the period, as adjusted             29,950    
Beginning Balance at Dec. 31, 2017     $ 438 $ 80,512 $ 800,806 $ 1,958 37,595 $ (22,222) $ (690,785)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock issued     11   41,631        
Restricted stock units recognized, net of forfeitures       26,538          
Restricted stock units delivered       (42,344)          
Exchangeable shares of subsidiary delivered           0      
Dividends             (4,428)    
Net income (loss) $ 28,098           28,098    
Currency translation adjustment, net of tax               (9,702)  
Repurchased   $ (8,600)             (177,786)
Ending Balance at Sep. 30, 2018 62,675   449 64,706 842,437 1,958 53,620 (31,924) (868,571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of the change in accounting principle related to revenue recognition             0    
Retained earnings, beginning of the period, as adjusted             43,714    
Beginning Balance at Jun. 30, 2018     448 55,843 840,249 1,958 43,714 (29,461) (810,186)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock issued     1   2,188        
Restricted stock units recognized, net of forfeitures       11,295          
Restricted stock units delivered       (2,432)          
Exchangeable shares of subsidiary delivered           0      
Dividends             (1,311)    
Net income (loss) 11,217           11,217    
Currency translation adjustment, net of tax               (2,463)  
Repurchased                 (58,385)
Ending Balance at Sep. 30, 2018 62,675   449 64,706 842,437 1,958 53,620 (31,924) (868,571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of the change in accounting principle related to revenue recognition             0    
Retained earnings, beginning of the period, as adjusted             63,427    
Beginning Balance at Dec. 31, 2018 62,363   450 71,596 846,721 1,958 63,427 (35,705) (886,084)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock issued     18   40,504        
Restricted stock units recognized, net of forfeitures       34,311          
Restricted stock units delivered       (39,111)          
Exchangeable shares of subsidiary delivered           (1,958)      
Dividends             (4,042)    
Net income (loss) (13,154)           (13,154)    
Currency translation adjustment, net of tax               (4,319)  
Repurchased   $ (13,700)             (46,262)
Ending Balance at Sep. 30, 2019 28,350   468 66,796 887,225 0 46,231 (40,024) (932,346)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of the change in accounting principle related to revenue recognition             0    
Retained earnings, beginning of the period, as adjusted             32,645    
Beginning Balance at Jun. 30, 2019     467 56,911 884,646 0 32,645 (35,977) (915,864)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock issued     1   2,579        
Restricted stock units recognized, net of forfeitures       12,636          
Restricted stock units delivered       (2,751)          
Exchangeable shares of subsidiary delivered           0      
Dividends             (1,343)    
Net income (loss) 14,929           14,929    
Currency translation adjustment, net of tax               (4,047)  
Repurchased                 (16,482)
Ending Balance at Sep. 30, 2019 $ 28,350   $ 468 $ 66,796 $ 887,225 $ 0 $ 46,231 $ (40,024) $ (932,346)