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Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2017 - 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, 2016 $ 480,021 $ 1,282 $ (471,311) $ 655,629 $ 294,925 $ (504)
Balance, Shares at Dec. 31, 2016   128,191 74,147      
Net income 35,872       35,872  
Other comprehensive income 217         217
Share repurchases (5,675)   $ (5,675)      
Share repurchases, Shares     400      
Restricted stock   $ 3   (3)    
Restricted stock, Shares   294        
Stock options exercised $ 5,649 $ 8   5,641    
Stock options exercised, Shares 805 805        
Share-based compensation $ 2,790     2,790    
Business acquisitions 4,488 $ 3   4,485    
Business acquisitions, Shares   312        
Balance, Amount at Jun. 30, 2017 $ 523,362 $ 1,296 $ (476,986) $ 668,542 $ 330,797 $ (287)
Balance, Shares at Jun. 30, 2017   129,602 74,547