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Consolidated Statements of Stockholders' Equity - 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, 2012 $ 295,232 $ 1,124 $ (371,080) $ 560,810 $ 105,131 $ (753)
Balance, Shares at Dec. 31, 2012   112,374 62,009      
Net income 85,863       85,863  
Other comprehensive income 28         28
Share repurchases (26,468)   $ (26,468)      
Share repurchases, Shares     3,984      
Restricted stock   $ 4   (4)    
Restricted stock, Shares   438        
Stock options exercised 13,976 $ 18   13,958    
Stock options exercised, Shares   1,846        
Share-based compensation 5,655     5,655    
Tax benefit from employee share plans 1,913     1,913    
Business acquisitions 2,073 $ 3   2,070    
Business acquisitions, Shares   299        
Balance, Amount at Dec. 31, 2013 374,446 $ 1,149 $ (397,548) 580,576 190,994 (725)
Balance, Shares at Dec. 31, 2013   114,957 65,993      
Net income 29,759       29,759  
Other comprehensive income 30         30
Share repurchases (28,137)   $ (28,137)      
Share repurchases, Shares     3,340      
Restricted stock   $ 5   (5)    
Restricted stock, Shares   464        
Stock options exercised 11,356 $ 15   11,341    
Stock options exercised, Shares   1,507        
Share-based compensation 6,205     6,205    
Tax benefit from employee share plans 133     133    
Convertible bond retirement 2,654 $ 15   2,639    
Convertible bond retirement, Shares   1,477        
Business acquisitions 3,665 $ 4   3,661    
Business acquisitions, Shares   415        
Balance, Amount at Dec. 31, 2014 399,845 $ 1,188 $ (425,685) 604,284 220,753 (695)
Balance, Shares at Dec. 31, 2014   118,820 69,333      
Net income 34,107       34,107  
Other comprehensive income 62         62
Share repurchases (36,482)   $ (36,482)      
Share repurchases, Shares     3,895      
Restricted stock   $ 4   (4)    
Restricted stock, Shares   360        
Stock options exercised $ 10,728 $ 15   10,713    
Stock options exercised, Shares 1,548 1,548        
Share-based compensation $ 5,729     5,729    
Tax benefit from employee share plans 772     772    
Convertible bond retirement 9,473 $ 51   9,422    
Convertible bond retirement, Shares   5,069        
Business acquisitions 3,714 $ 4   3,710    
Business acquisitions, Shares   385        
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