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Consolidated Statements Of Shareholders’ Equity (USD $)
In Thousands, except Share data
Common Class A [Member]
Common Class B [Member]
Common Stock [Member]
USD ($)
Additional Paid-in Capital [Member]
USD ($)
Treasury Stock [Member]
USD ($)
Retained Earnings [Member]
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Total
USD ($)
Balance, amount at Dec. 31, 2010     $ 391 $ 195,747 $ (17,948) $ 286,951 $ (222) $ 464,919
Balance, shares (in Shares) at Dec. 31, 2010 26,799,000 10,700,000            
Stock options exercised, amount     5 6,303       6,308
Stock options exercised, shares (in Shares) 455,000 77,000            
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       5,683       5,683
Vesting of restricted share awards, amount     1 (1)        
Vesting of restricted share awards, shares (in Shares) 90,000              
Issuance of common stock under employee stock purchase plan, amount     1 837       838
Issuance of common stock under employee stock purchase plan, shares (in Shares) 62,000              
Other comprehensive income (loss)             (1,727) (1,727)
Net income           55,213   55,213
Balance, amount at Dec. 31, 2011     398 208,569 (17,948) 342,164 (1,949) 531,234
Balance, shares (in Shares) at Dec. 31, 2011 27,406,000 10,777,000            
Stock options exercised, amount     4 5,722       5,726
Stock options exercised, shares (in Shares) 439,000 15,000            
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       7,332       7,332
Vesting of restricted share awards, amount     1 (62)       (61)
Vesting of restricted share awards, shares (in Shares) 83,000              
Issuance of common stock under employee stock purchase plan, amount     1 1,066       1,067
Issuance of common stock under employee stock purchase plan, shares (in Shares) 71,000              
Other comprehensive income (loss)             193 193
Net income           62,455   62,455
Balance, amount at Dec. 31, 2012     404 222,627 (17,948) 404,619 (1,756) 607,946
Balance, shares (in Shares) at Dec. 31, 2012 27,999,000 10,792,000            
Stock options exercised, amount     8 11,325       11,333
Stock options exercised, shares (in Shares) 747,000 43,000           775,543
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       8,645       8,645
Vesting of restricted share awards, amount     1 (711)       (710)
Vesting of restricted share awards, shares (in Shares) 85,000 24,000            
Issuance of common stock under employee stock purchase plan, amount     1 1,268       1,269
Issuance of common stock under employee stock purchase plan, shares (in Shares) 80,000              
Common stock repurchases         (12,873)     (12,873)
Common stock repurchases (in Shares)   (554,000)            
Other comprehensive income (loss)             554 554
Net income           49,217   49,217
Balance, amount at Dec. 31, 2013     $ 414 $ 243,154 $ (30,821) $ 453,836 $ (1,202) $ 665,381
Balance, shares (in Shares) at Dec. 31, 2013 28,911,000 10,305,000