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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2017 37,729,000 37,729,000      
Beginning Balance at Dec. 31, 2017 $ 1,191,971 $ 377 $ 266,035 $ 1,045,774 $ (120,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 38,945     38,945  
Other comprehensive income:          
Cumulative translation adjustment 10,446       10,446
Issuance of common stock in connection with:          
Exercise of options (in shares)   153,000      
Exercise of options 5,794 $ 1 5,793    
Restricted share grants, less net settled shares of XX (in shares)   175,000      
Restricted share grants, less net settled shares of 35 (1,579) $ 2 (1,581)    
Stock units issued under incentive compensation plan 1,059   1,059    
Purchase and retirement of common stock (in shares)   (337,000)      
Purchase and retirement of common stock (14,220) $ (3) (14,217)    
Cumulative effect due to adoption of new accounting standard 342     342  
Share-based compensation $ 4,676   4,676    
Ending Balance (in shares) at Mar. 31, 2018 37,720,000 37,720,000      
Ending Balance at Mar. 31, 2018 $ 1,237,434 $ 377 $ 261,765 $ 1,085,061 $ (109,769)