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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Class A & 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]
Total
Balance at Dec. 31, 2008 $ 419 $ 174,355 $ (15,458) $ 265,287   $ (109,419) $ 315,184
Balance, shares at Dec. 31, 2008 41,887,088         (4,254,445)  
Purchase of treasury shares           (1,101) (1,101)
Purchase of treasury shares, shares           (43,408)  
Issuance of restricted stock awards, net of forfeitures   (5,166)       5,166  
Issuance of restricted stock awards, net of forfeitures, shares           201,091  
Share-based compensation expense   4,394         4,394
Exercise of non-qualified options   (2,965)       3,221 256
Exercise of non-qualified options, shares           125,300  
Tax benefit of share-based compensation plans   852         852
Net income       34,265     34,265
Foreign currency translation adjustment         (9)   (9)
Comprehensive income             34,256
Balance at Dec. 31, 2009 419 171,470 (15,458) 299,552 (9) (102,133) 353,841
Balance, shares at Dec. 31, 2009 41,887,088         (3,971,462)  
Purchase of treasury shares           (25,070) (25,070)
Purchase of treasury shares, shares           (839,448)  
Issuance of restricted stock awards, net of forfeitures   (5,024)       5,024  
Issuance of restricted stock awards, net of forfeitures, shares           194,677  
Share-based compensation expense   3,576         3,576
Exercise of non-qualified options   (734)       780 46
Exercise of non-qualified options, shares           29,800  
Tax benefit of share-based compensation plans   434         434
Net income       43,458     43,458
Foreign currency translation adjustment         15   15
Comprehensive income             43,473
Balance at Dec. 31, 2010 419 169,722 (15,458) 343,010 6 (121,399) 376,300
Balance, shares at Dec. 31, 2010 41,887,088         (4,586,433)  
Purchase of treasury shares           (1,523) (1,523)
Purchase of treasury shares, shares           (43,247)  
Issuance of restricted stock awards, net of forfeitures   (5,312)       5,312  
Issuance of restricted stock awards, net of forfeitures, shares           207,848  
Share-based compensation expense   4,792         4,792
Exercise of non-qualified options   (1,436)       1,522 86
Exercise of non-qualified options, shares           57,300 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)
Comprehensive income             58,176
Balance at Dec. 31, 2011 $ 419 $ 168,800 $ (15,458) $ 401,188 $ 4 $ (116,088) $ 438,865
Balance, shares at Dec. 31, 2011 41,887,088         (4,364,532)