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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated other comprehensive income $ (6,677) $ 1,443 $ 678 $ 972
Treasury Stock, Shares 15,605,000 12,605,000 12,605,000 12,605,000
Treasury Stock, Value (234,715) (132,543) 132,543 132,543
Non-controlling interests 323 (180) (118)  
Common stock – $.0001 par value, 135,000 shares authorized, 82,941 and 81,795 shares issued, 67,336 and 69,191 shares outstanding 7 5 5 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in Shares) 563,000 874,500 658,500  
Exercise of stock options   9,271 4,995  
Tax benefit from exercise of options   4,608 4,154  
Tax Benefit from Stock Based Compensation 4,277 4,608 4,154  
Issuance of fully vested restricted stock (in Shares) 582,000      
Stock-based compensation 20,141 17,434 11,404  
Unrealized holding gain on marketable securities net of taxes   699 (85)  
Unrealized Gain (Loss) on Cash Flow Hedging Instruments   87    
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (775)      
Net loss attributable to noncontrolling interests 1,278 (62) (118)  
Foreign currency translation adjustment   (21) (209)  
Net income 133,285 119,564 97,201  
Balance (in Shares) 67,336,000      
Balance 678,840 626,400 474,758 357,298
Additional paid-in capital 247,858 217,638 186,325 165,773
Retained earnings 672,044 540,037 420,411 323,092
Stock Repurchased During Period, Shares 3,000,167      
Payments for Repurchase of Common Stock (102,172) 0 0  
Common Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in Shares) 563,000 874,000 659,000  
Exercise of stock options 2 0 1  
Issuance of fully vested restricted stock (in Shares)   3,809,000 819,000  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures   0 0  
Balance (in Shares)   69,191,000 64,508,000 63,030,000
Stock Repurchased During Period, Shares (3,000,000)      
Additional Paid-in Capital [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options 5,802 9,271 4,994  
Tax benefit from exercise of options 4,277 4,608 4,154  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures   0 0  
Stock-based compensation 20,141 17,434 11,404  
Retained Earnings [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options   0    
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures   0 0  
Net income 132,007 119,626 97,319  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Unrealized holding gain on marketable securities net of taxes (3,468) 699 (85)  
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (370)      
Foreign currency translation adjustment (4,282) (21) (209)  
Stockholders' Equity, Total [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options 5,804      
Tax benefit from exercise of options 4,277      
Stock-based compensation 20,141      
Unrealized holding gain on marketable securities net of taxes (3,468)      
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (370)      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (775)      
Foreign currency translation adjustment (4,282)      
Net income 133,285      
Balance 678,840      
Payments for Repurchase of Common Stock 102,172      
Treasury Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock Repurchased During Period, Shares 3,000,000      
Payments for Repurchase of Common Stock $ (102,172)