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Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2016 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Balance, Amount at Dec. 31, 2015 $ 427,948 $ 1,262 $ (462,167) $ 634,626 $ 254,860 $ (633)
Balance, Shares at Dec. 31, 2015   126,182 73,228      
Net income 29,897       29,897  
Other comprehensive loss (441)         (441)
Share repurchases (7,828)   $ (7,828)      
Share repurchases, Shares     799      
Restricted stock   $ 4   (4)    
Restricted stock, Shares   302        
Stock options exercised $ 3,529 $ 5   3,524    
Stock options exercised, Shares 510 510        
Share-based compensation $ 2,842     2,842    
Tax benefit from employee share plans 663     663    
Business acquisitions 3,815 $ 4   3,811    
Business acquisitions, Shares   372        
Balance, Amount at Jun. 30, 2016 $ 460,425 $ 1,275 $ (469,995) $ 645,462 $ 284,757 $ (1,074)
Balance, Shares at Jun. 30, 2016   127,366 74,027