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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Stockholders' Equity, Total [Member]
Treasury Stock [Member]
Accumulated other comprehensive loss $ (6,677,000)          
Treasury Stock, Shares 15,605,000          
Treasury Stock, Value $ (234,715,000)          
Non-controlling interests 323,000          
Common stock – $.0001 par value, 135,000 shares authorized, 86,417 and 85,263 shares issued, 60,410 and 61,693 shares outstanding 7,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Additional paid-in capital 247,858,000          
Retained earnings $ 672,044,000          
Exercise of stock options (in Shares) 340,000          
Exercise of stock options $ 4,943,000 $ 0        
Tax benefit from exercise of options $ 2,978,000          
Issuance of fully vested restricted stock (in Shares) 210,000          
Stock-based compensation $ 19,260,000          
Unrealized holding gain on marketable securities net of taxes 1,441,000          
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (1,278,000)          
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (946,000)          
Noncontrolling Interest, Increase from Business Combination 128,000          
Net loss attributable to noncontrolling interests 749,000          
Foreign currency translation adjustment (6,238,000)          
Net income $ 112,629,000   $ 111,880,000      
Balance (in Shares) at Dec. 31, 2013 67,336,000          
Balance (in Shares) at Dec. 31, 2014 63,625,000          
Balance at Dec. 31, 2013         $ 678,840,000  
Balance at Dec. 31, 2014         669,529,000  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Repurchased During Period, Shares (4,261,000)          
Payments for Repurchase of Common Stock $ (142,228,000)         $ (142,227,000)
Payments for Repurchase of Common Stock 1,000          
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, 86,417 and 85,263 shares issued, 60,410 and 61,693 shares outstanding 6,000          
Noncontrolling Interest in Operating Partnerships 148,000          
Additional paid-in capital 275,039,000          
Retained earnings 783,904,000          
Noncontrolling Interest in Operating Partnerships $ (20,000)          
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, 2015 61,693,000          
Balance at Dec. 31, 2015 $ 678,663,000       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, 86,417 and 85,263 shares issued, 60,410 and 61,693 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          
Tax benefit from exercise of options $ 5,000          
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, 86,417 and 85,263 shares issued, 60,410 and 61,693 shares outstanding 6,000          
Additional paid-in capital 353,443,000          
Retained earnings $ 1,017,753,000