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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Common Stock Held in Treasury
Balance at beginning of period (shares) at Dec. 31, 2013   0 39,377       10,429
Balance at beginning of period (value) at Dec. 31, 2013 $ 414,359 $ 0 $ 394 $ 176,675 $ 497,728 $ (7,751) $ (252,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     5        
Shares issued under share-based compensation plan (value) 0   $ 0        
Exercise of stock options (shares)     125        
Exercise of stock options (value) 2,262   $ 1 2,261      
Income tax benefit from exercise of stock options and warrants (value) 1,813     1,813      
Share-based compensation expense (value) 1,370     1,370      
Net income 58,225       58,225    
Currency translation adjustment, net of tax expense or benefit (4,628)         (4,628)  
Repurchases of treasury stock (shares)             771
Repurchases of treasury stock (value) (43,947)           $ (43,947)
Balance at end of period (shares) at Sep. 30, 2014   0 39,507       11,200
Balance at end of period (value) at Sep. 30, 2014 429,454 $ 0 $ 395 182,119 555,953 (12,379) $ (296,634)
Balance at beginning of period (shares) at Dec. 31, 2014   0 39,708       11,200
Balance at beginning of period (value) at Dec. 31, 2014 448,551 $ 0 $ 397 188,062 582,894 (26,168) $ (296,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     5        
Shares issued under share-based compensation plan (value) 0   $ 0        
Exercise of stock options (shares)     145        
Exercise of stock options (value) 2,901   $ 2 2,899      
Income tax benefit from exercise of stock options and warrants (value) 1,617     1,617      
Share-based compensation expense (value) 209     209      
Net income 41,300       41,300    
Currency translation adjustment, net of tax expense or benefit (22,874)         (22,874)  
Repurchases of treasury stock (shares)             661
Repurchases of treasury stock (value) (31,974)           $ (31,974)
Balance at end of period (shares) at Sep. 30, 2015   0 39,858       11,861
Balance at end of period (value) at Sep. 30, 2015 $ 439,730 $ 0 $ 399 $ 192,787 $ 624,194 $ (49,042) $ (328,608)