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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Common Class A [Member]
USD ($)
Common Stock [Member]
Common Class B [Member]
USD ($)
Additional Paid-in Capital [Member]
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Retained Earnings [Member]
USD ($)
Common Class A [Member]
Total
USD ($)
Balance at Dec. 31, 2010 $ 284,807 $ 468 $ 10,972 $ (4,869) $ 28,839   $ 320,217
Balance (in Shares) at Dec. 31, 2010 22,523,000 3,762,000          
Net income         58,860   58,860
Fair value of interest rate swap agreements, net of tax expense (benefit)       361     361
Issuance of stock in connection with employee stock plans 5,654           5,654
Issuance of stock in connection with employee stock plans (in Shares) 438,000            
Issuance of restricted stock to employees (in Shares) 11,000            
Shares forfeited by employees (in Shares) (5,000)            
Repurchase of Class A common stock (13,568)           (13,568)
Repurchase of Class A common stock (in Shares) (772,000)           (419,376)
Compensation for stock and stock option issuances and excess tax benefits from option exercises 2,473   (54)       2,419
Dividends paid         (6,822)   (6,822)
Balance at Dec. 31, 2011 279,366 468 10,918 (4,508) 80,877   367,121
Balance (in Shares) at Dec. 31, 2011 22,195,000 3,762,000          
Net income         80,362   80,362
Fair value of interest rate swap agreements, net of tax expense (benefit)       1,893     1,893
Issuance of stock in connection with employee stock plans 8,652           8,652
Issuance of stock in connection with employee stock plans (in Shares) 647,000            
Issuance of restricted stock to employees (in Shares) 3,000            
Repurchase of Class A common stock (23,279)           (23,279)
Repurchase of Class A common stock (in Shares) (929,000)            
Class B common stock converted to Class A common stock 125 (125)          
Class B common stock converted to Class A common stock (in Shares) 1,000,000 (1,000,000)          
Compensation for stock and stock option issuances and excess tax benefits from option exercises 3,937   1,481       5,418
Dividends paid         (12,066)   (12,066)
Balance at Dec. 31, 2012 268,801 343 12,399 (2,615) 149,173   428,101
Balance (in Shares) at Dec. 31, 2012 22,916,000 2,762,000          
Net income         106,000   106,000
Fair value of interest rate swap agreements, net of tax expense (benefit)       1,077     1,077
Issuance of stock in connection with employee stock plans 5,149           5,149
Issuance of stock in connection with employee stock plans (in Shares) 283,000            
Issuance of restricted stock to employees (in Shares) 117,000            
Repurchase of Class A common stock (7,903)           (7,903)
Repurchase of Class A common stock (in Shares) (187,000)            
Class B common stock converted to Class A common stock 24 (24)          
Class B common stock converted to Class A common stock (in Shares) 200,000 (200,000)          
Compensation for stock and stock option issuances and excess tax benefits from option exercises 2,184   10,199       12,383
Dividends paid         (10,085)   (10,085)
Balance at Dec. 31, 2013 $ 268,255 $ 319 $ 22,598 $ (1,538) $ 245,088   $ 534,722
Balance (in Shares) at Dec. 31, 2013 23,329,000 2,562,000