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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($)
$ in Thousands
Total
Class A and B Common Stock [Member]
Additional Paid-in Capital [Member]
Purchase Price Of Excess Of Predecessor Basis, Net Of Tax [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2012 $ 500,897 $ 419 $ 167,765 $ (15,458) $ 469,141 $ 1 $ (120,971)
Beginning Balance (in shares) at Dec. 31, 2012   41,887,088         (4,457,307)
Purchase of treasury shares (13,791)           $ (13,791)
Purchase of treasury shares (in shares)             (377,906)
Stock tendered for payments of withholding taxes (2,634)           $ (2,634)
Stock tendered for payments of withholding taxes (in shares)             (75,995)
Issuance of restricted stock awards, net of forfeitures     (7,990)       $ 7,990
Issuance of restricted stock awards, net of forfeitures (in shares)             296,300
Share-based compensation expense 7,667   7,667        
Exercise of non-qualified options 41   (408)       $ 449
Exercise of non-qualified options (in shares)             16,500
Tax benefit of share-based compensation plans 323   323        
Net income 69,110       69,110    
Foreign currency translation adjustment (86)         (86)  
Ending Balance at Dec. 31, 2013 561,527 $ 419 167,357 (15,458) 538,251 (85) $ (128,957)
Ending Balance (in shares) at Dec. 31, 2013   41,887,088         (4,598,408)
Purchase of treasury shares (18,024)           $ (18,024)
Purchase of treasury shares (in shares)             (501,271)
Stock tendered for payments of withholding taxes (3,195)           $ (3,195)
Stock tendered for payments of withholding taxes (in shares)             (80,772)
Issuance of restricted stock awards, net of forfeitures     (5,032)       $ 5,032
Issuance of restricted stock awards, net of forfeitures (in shares)             202,983
Share-based compensation expense 8,258   8,258        
Tax benefit of share-based compensation plans 652   652        
Net income 51,558       51,558    
Foreign currency translation adjustment 8         8  
Ending Balance at Dec. 31, 2014 600,784 $ 419 171,235 (15,458) 589,809 (77) $ (145,144)
Ending Balance (in shares) at Dec. 31, 2014   41,887,088         (4,977,468)
Purchase of treasury shares $ (28,823)           $ (28,823)
Purchase of treasury shares (in shares) (735,524)           (735,524)
Stock tendered for payments of withholding taxes $ (2,916)           $ (2,916)
Stock tendered for payments of withholding taxes (in shares)             (77,732)
Issuance of restricted stock awards, net of forfeitures     (4,897)       $ 4,897
Issuance of restricted stock awards, net of forfeitures (in shares)             199,893
Share-based compensation expense 7,833   7,833        
Tax benefit of share-based compensation plans 114   114        
Net income 70,949       70,949    
Foreign currency translation adjustment (101)         (101)  
Ending Balance at Dec. 31, 2015 $ 647,840 $ 419 $ 174,285 $ (15,458) $ 660,758 $ (178) $ (171,986)
Ending Balance (in shares) at Dec. 31, 2015   41,887,088         (5,590,831)