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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (USD $)
In Thousands, except Share data
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, 2010 $ 376,300 $ 419 $ 169,722 $ (15,458) $ 343,010 $ 6 $ (121,399)
Beginning Balance (in shares) at Dec. 31, 2010   41,887,088         (4,586,433)
Stock tendered for payments of withholding taxes (1,523)           (1,523)
Stock tendered for payments of withholding taxes (in shares)             (43,247)
Issuance of restricted stock awards, net of forfeitures     (5,312)       5,312
Issuance of restricted stock awards, net of forfeitures (in shares)             207,848
Share-based compensation expense 4,792   4,792        
Exercise of non-qualified options 86   (1,436)       1,522
Exercise of non-qualified options (in shares)             57,300
Tax benefit of share-based compensation plans 1,034   1,034        
Net income 58,178       58,178    
Foreign currency translation adjustment (2)         (2)  
Ending Balance at Dec. 31, 2011 438,865 419 168,800 (15,458) 401,188 4 (116,088)
Ending Balance (in shares) at Dec. 31, 2011   41,887,088         (4,364,532)
Purchase of treasury shares (11,208)           (11,208)
Purchase of treasury shares (in shares)             (347,592)
Stock tendered for payments of withholding taxes (1,812)           (1,812)
Stock tendered for payments of withholding taxes (in shares)             (55,463)
Issuance of restricted stock awards, net of forfeitures     (7,148)       7,148
Issuance of restricted stock awards, net of forfeitures (in shares)             273,180
Share-based compensation expense 6,539   6,539        
Exercise of non-qualified options 69   (920)       989
Exercise of non-qualified options (in shares)             37,100
Tax benefit of share-based compensation plans 494   494        
Net income 67,953       67,953    
Foreign currency translation adjustment (3)         (3)  
Ending Balance at Dec. 31, 2012 500,897 419 167,765 (15,458) 469,141 1 (120,971)
Ending 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)           (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           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)