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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
Total
Retained Earnings [Member]
Noncontrolling Interest [Member]
Stockholders' Equity, Total [Member]
Treasury Stock [Member]
Accumulated other comprehensive loss $ (12,752,000)        
Treasury Stock, Shares 19,866,000        
Treasury Stock, Value $ (376,942,000)        
Non-controlling interests 274,000        
Common stock – $.0001 par value, 135,000 shares authorized, 87,306 and 86,417 shares issued, 58,698 and 60,410 shares outstanding 6,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Additional paid-in capital 275,039,000        
Retained earnings $ 783,904,000        
Exercise of stock options (in Shares) 1,460,000        
Exercise of stock options $ 21,301,000        
Tax benefit from exercise of options $ 10,510,000        
Issuance of fully vested restricted stock (in Shares) 312,000        
Stock-based compensation $ 18,698,000        
Unrealized holding gain on marketable securities net of taxes (1,173,000)        
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1,246,000        
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (732,000)        
Noncontrolling Interest, Increase from Business Combination 0        
Net loss attributable to noncontrolling interests 717,000        
Foreign currency translation adjustment (18,734,000)        
Net income $ 113,655,000 $ 112,938,000      
Balance (in Shares) at Dec. 31, 2014 63,625,000        
Balance (in Shares) at Dec. 31, 2015 61,693,000        
Balance at Dec. 31, 2014       $ 669,529,000  
Balance at Dec. 31, 2015       678,663,000  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Repurchased During Period, Shares (3,704,000)        
Payments for Repurchase of Common Stock $ (135,637,000)       $ (135,637,000)
Payments for Repurchase of Common Stock 0        
Accumulated other comprehensive loss $ (31,413,000)        
Treasury Stock, Shares 23,570,000        
Treasury Stock, Value $ (512,579,000)        
Non-controlling interests 259,000        
Common stock – $.0001 par value, 135,000 shares authorized, 87,306 and 86,417 shares issued, 58,698 and 60,410 shares outstanding 6,000        
Additional paid-in capital 325,548,000        
Retained earnings $ 896,842,000        
Exercise of stock options (in Shares) 746,000        
Exercise of stock options $ 10,713,000        
Issuance of fully vested restricted stock (in Shares) 408,000        
Stock-based compensation $ 19,509,000        
Payments to Acquire Businesses, Gross     $ (2,327,000)    
Unrealized holding gain on marketable securities net of taxes 1,303,000        
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 506,000        
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (417,000)        
Net loss attributable to noncontrolling interests 363,000        
Foreign currency translation adjustment (2,147,000)        
Net income $ 121,274,000 120,911,000      
Balance (in Shares) at Dec. 31, 2016 60,410,000        
Balance at Dec. 31, 2016 $ 741,072,000     741,072,000  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Repurchased During Period, Shares 2,437,000        
Payments for Repurchase of Common Stock $ (86,005,000)       86,005,000
Payments for Repurchase of Common Stock 0        
Accumulated other comprehensive loss $ (31,751,000)        
Treasury Stock, Shares 26,007,000        
Treasury Stock, Value $ (598,584,000)        
Non-controlling interests 205,000        
Common stock – $.0001 par value, 135,000 shares authorized, 87,306 and 86,417 shares issued, 58,698 and 60,410 shares outstanding 6,000        
Additional paid-in capital 353,443,000        
Retained earnings $ 1,017,753,000        
Exercise of stock options (in Shares) 655,000        
Exercise of stock options $ 16,433,000        
Issuance of fully vested restricted stock (in Shares) 234,000        
Stock-based compensation $ 20,847,000        
Payments to Acquire Businesses, Gross 37,112,000        
Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Redeemable 4,716,000        
Unrealized holding gain on marketable securities net of taxes 116,000        
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (814,000)        
Net loss attributable to noncontrolling interests 1,190,000        
Foreign currency translation adjustment 6,836,000        
Net income $ 119,138,000 $ 117,948,000      
Balance (in Shares) at Dec. 31, 2017 58,698,000        
Balance at Dec. 31, 2017 $ 808,932,000     $ 808,932,000  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Repurchased During Period, Shares (2,601,000)        
Payments for Repurchase of Common Stock $ (99,412,000)       $ 99,412,000
Accumulated other comprehensive loss $ (25,613,000)        
Treasury Stock, Shares 28,608,000        
Treasury Stock, Value $ (697,996,000)        
Non-controlling interests 6,111,000        
Common stock – $.0001 par value, 135,000 shares authorized, 87,306 and 86,417 shares issued, 58,698 and 60,410 shares outstanding 6,000        
Additional paid-in capital 390,723,000        
Retained earnings $ 1,135,701,000