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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other comprehensive income $ 1,443 $ 678 $ 972 $ 700
Treasury Stock, Shares 8,403,000 8,403,000 8,403,000 8,262,000
Treasury Stock, Value (132,543) (132,543) (132,543) (127,984)
Noncontrolling interests (180) (118)    
Common stock – $.0001 par value, 60,000 shares authorized, 54,530 and 51,408 shares issued, 46,127 and 43,005 shares outstanding at December 31, 2012 and 2011, respectively 5 5 4 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in Shares) 583,000 439,000 647,000  
Exercise of stock options 9,271 4,995 5,082  
Tax benefit from exercise of options 4,608 4,154    
Tax Benefit from Stock Based Compensation 4,608 4,154 4,718  
Stock-based compensation 17,434 11,404 8,271  
Unrealized holding gain on marketable securities net of taxes 699 (85) 272  
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 87      
Net loss attributable to noncontrolling interests (62) (118) 0  
Foreign currency translation adjustment (21) (209)    
Net income 119,564 97,201 75,725  
Forfeiture of accrued dividends     2  
Treasury Stock, Value, Acquired, Cost Method     (4,559)  
Balance 626,400 474,758 357,298 267,787
Additional paid-in capital 217,638 186,325 165,773 147,703
Retained earnings 540,037 420,411 323,092 247,365
Common Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in Shares) 583,000 439,000 646,000  
Exercise of stock options 0 1 1  
Issuance of fully vested restricted stock (in Shares) 2,539,000 546,000 447,000  
Balance (in Shares) 46,127,000 43,005,000 42,020,000 40,927,000
Additional Paid-in Capital [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options 9,271 4,994 5,081  
Tax benefit from exercise of options 4,608 4,154    
Tax Benefit from Stock Based Compensation     4,718  
Stock-based compensation 17,434 11,404 8,271  
Retained Earnings [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 119,626 97,319 75,725  
Forfeiture of accrued dividends     2  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Unrealized holding gain on marketable securities net of taxes 699 (85) 272  
Foreign currency translation adjustment (21) (209)    
Treasury Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Treasury Stock, Shares, Acquired     141,000  
Treasury Stock, Value, Acquired, Cost Method     $ (4,559)