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Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, except Share data
Total
USD ($)
Common Stock Shares Outstanding Class A
Common Stock Shares Outstanding Class B
$0.01 Par Value
USD ($)
Additional Paid-In Capital
USD ($)
Treasury Stock
USD ($)
Retained Earnings
USD ($)
Accumulated Other Comprehensive Loss
USD ($)
Balance at Dec. 31, 2008 $ 416,041     $ 386 $ 183,818 $ (17,948) $ 249,785 $ 0
Balance, shares at Dec. 31, 2008   26,256 10,685          
Stock options exercised (including tax effect of ($191), $885 and $1,628 for the period ending Dec 31, 2009, 2010 and 2011 respectively) (55)       (55)      
Stock options exercised (including tax effect of ($191), $885 and $1,628 for the period ending Dec 31, 2009, 2010 and 2011 respectively), shares   23 4          
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 3,664       3,664      
Vesting of restricted share awards       1 (1)      
Vesting of restricted share awards, shares   68            
Issuance of common stock under employee stock purchase plan 691     1 690      
Issuance of common stock under employee stock purchase plan, shares   91            
Net income 5,884           5,884  
Balance at Dec. 31, 2009 426,225     388 188,116 (17,948) 255,669 0
Balance, shares at Dec. 31, 2009   26,438 10,689          
Stock options exercised (including tax effect of ($191), $885 and $1,628 for the period ending Dec 31, 2009, 2010 and 2011 respectively) 2,488     2 2,486      
Stock options exercised (including tax effect of ($191), $885 and $1,628 for the period ending Dec 31, 2009, 2010 and 2011 respectively), shares   212 11          
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 4,468       4,468      
Vesting of restricted share awards       1 (1)      
Vesting of restricted share awards, shares   83            
Issuance of common stock under employee stock purchase plan 678       678      
Issuance of common stock under employee stock purchase plan, shares   66            
Fair value adjustment of interest rate swaps, net of tax (222)             (222)
Net income 31,282           31,282  
Balance at Dec. 31, 2010 464,919     391 195,747 (17,948) 286,951 (222)
Balance, shares at Dec. 31, 2010   26,799 10,700          
Stock options exercised (including tax effect of ($191), $885 and $1,628 for the period ending Dec 31, 2009, 2010 and 2011 respectively) 6,308     5 6,303      
Stock options exercised (including tax effect of ($191), $885 and $1,628 for the period ending Dec 31, 2009, 2010 and 2011 respectively), shares   455 77          
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 5,683       5,683      
Vesting of restricted share awards       1 (1)      
Vesting of restricted share awards, shares   90            
Issuance of common stock under employee stock purchase plan 838     1 837      
Issuance of common stock under employee stock purchase plan, shares   62            
Fair value adjustment of interest rate swaps, net of tax (1,140)             (1,140)
Unrealized loss on available-for-sale securities, net of tax (587)             (587)
Net income 55,213           55,213  
Balance at Dec. 31, 2011 $ 531,234     $ 398 $ 208,569 $ (17,948) $ 342,164 $ (1,949)
Balance, shares at Dec. 31, 2011   27,406 10,777