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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Class A
Common Stock
Class B
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Balance (in shares) at Dec. 31, 2014   23,671 2,562      
Balance at Dec. 31, 2014 $ 673,105 $ 276,058 $ 319 $ 29,775 $ (926) $ 367,879
Net income 182,999         182,999
Gain on cash flow hedges, net of tax expense of $0, $175, and $399 649       649  
Issuance of stock in connection with employee stock plans (in shares)   74        
Issuance of stock in connection with employee stock plans 6,065 $ 6,065        
Issuance of restricted stock to employees (in shares)   217        
Repurchase of Class A common stock (in shares)   (306)        
Repurchase of Class A common stock (31,548) $ (31,548)        
Class B common stock converted to Class A common stock (in shares)   20        
Class B common stock converted to Class A common stock 0 $ 3 $ (3)      
Class B common stock converted to Class A common stock (in shares)     (20)      
Compensation for stock and stock option issuances and excess tax benefits from option exercises 16,879 $ 7,832   9,047    
Dividends paid (19,985)         (19,985)
Balance (in shares) at Dec. 31, 2015   23,676 2,542      
Balance at Dec. 31, 2015 828,164 $ 258,410 $ 316 38,822 (277) 530,893
Net income 197,058         197,058
Gain on cash flow hedges, net of tax expense of $0, $175, and $399 277       277  
Issuance of stock in connection with employee stock plans (in shares)   93        
Issuance of stock in connection with employee stock plans 6,932 $ 6,932        
Issuance of restricted stock to employees (in shares)   241        
Repurchase of Class A common stock (in shares)   (1,408)        
Repurchase of Class A common stock (112,939) $ (112,939)        
Class B common stock converted to Class A common stock (in shares)   780        
Class B common stock converted to Class A common stock 0 $ 97 $ (97)      
Class B common stock converted to Class A common stock (in shares)     (780)      
Compensation for stock and stock option issuances and excess tax benefits from option exercises 15,415 $ 13,012   2,403    
Dividends paid (24,131)         (24,131)
Balance (in shares) at Dec. 31, 2016   23,382 1,762      
Balance at Dec. 31, 2016 910,776 $ 165,512 $ 219 41,225 0 703,820
Net income 245,217         245,217
Gain on cash flow hedges, net of tax expense of $0, $175, and $399         0  
Issuance of stock in connection with employee stock plans (in shares)   90        
Issuance of stock in connection with employee stock plans 7,509 $ 7,509        
Issuance of restricted stock to employees (in shares)   91        
Repurchase of Class A common stock (in shares)   (361)        
Repurchase of Class A common stock (33,753) $ (33,753)        
Class B common stock converted to Class A common stock (in shares)   762        
Class B common stock converted to Class A common stock 0 $ 95 $ (95)      
Class B common stock converted to Class A common stock (in shares)     (762)      
Compensation for stock and stock option issuances and excess tax benefits from option exercises 11,272 $ 7,623   3,649    
Option premiums paid (33,396)     (33,396)    
Dividends paid (26,544)         (26,544)
Issuance of stock in connection with acquisitions (in shares)   4        
Issuance of stock in connection with acquisitions 2,137 $ 2,137        
Balance (in shares) at Dec. 31, 2017   23,968 1,000      
Balance at Dec. 31, 2017 1,083,218 $ 149,123 $ 124 11,309 $ 0 922,662
Adjustment to adopt ASU 2016-09 $ 0     $ (169)   $ 169