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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Retained Earnings
Non-controlling interest in subsidiaries
Beginning Balance (in shares) at Dec. 31, 2014   38,897          
Beginning balance at Dec. 31, 2014 $ 1,077,721 $ 430 $ 179,077 $ (50,581) $ (150,331) $ 1,081,730 $ 17,396
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock issued upon exercise of stock options (in shares)   2          
Stock issued upon exercise of stock options 24 $ 0 24        
Tax expense from stock option and restricted stock units (230)   (230)        
Stock issued upon vesting of restricted and deferred stock units (in shares)   56          
Stock issued upon vesting of restricted and deferred stock units 0 $ 1 (1)        
Stock-based compensation, net of share repurchases for tax withholdings 7,845   7,845        
Purchase of shares of treasury stock (in shares)   (210)          
Purchase of shares of treasury stock (22,011)       (22,011)    
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 50     50      
Foreign currency translation (51,055)     (49,382)     (1,673)
Adjustment of redeemable non-controlling interest (32,448)   (13,927) (9,108)   (9,413)  
Net income (loss) 87,025         90,416 (3,391)
Ending Balance (in shares) at Sep. 30, 2015   38,745          
Ending balance at Sep. 30, 2015 1,066,921 $ 431 172,788 (109,021) (172,342) 1,162,733 12,332
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 99            
Ending Balance (in shares) at Sep. 30, 2015   38,745          
Ending balance at Sep. 30, 2015 1,066,921 $ 431 172,788 (109,021) (172,342) 1,162,733 12,332
Beginning Balance (in shares) at Dec. 31, 2015   38,746          
Beginning balance at Dec. 31, 2015 1,095,681 $ 431 174,972 (103,451) (172,342) 1,183,634 12,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock issued upon exercise of stock options (in shares)   21          
Stock issued upon exercise of stock options 283 $ 0 283        
Tax expense from stock option and restricted stock units (300)   (300)        
Stock issued upon vesting of restricted and deferred stock units (in shares)   61          
Stock issued upon vesting of restricted and deferred stock units 1 $ 1 0        
Stock-based compensation, net of share repurchases for tax withholdings 12,142   12,142        
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 209     209      
Stock issued for purchase of EFS (in shares)   4,012          
Stock issued for purchase of EFS 354,953 $ 40 354,913        
Foreign currency translation 899     709     190
Net income (loss) 54,337         55,350 (1,013)
Ending Balance (in shares) at Sep. 30, 2016   42,840          
Ending balance at Sep. 30, 2016 1,518,205 $ 472 542,010 (102,533) (172,342) 1,238,984 11,614
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 (62)            
Ending Balance (in shares) at Sep. 30, 2016   42,840          
Ending balance at Sep. 30, 2016 $ 1,518,205 $ 472 $ 542,010 $ (102,533) $ (172,342) $ 1,238,984 $ 11,614