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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity, Total [Member]
Treasury Stock [Member]
Accumulated other comprehensive loss $ 1,443            
Treasury Stock, Shares 12,605,000            
Treasury Stock, Value $ (132,543)            
Non-controlling interests (180)            
Common stock – $.0001 par value, 135,000 shares authorized, 85,263 and 83,491 shares issued, 61,693 and 63,625 shares outstanding 5            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Additional paid-in capital 217,638            
Retained earnings $ 540,037            
Exercise of stock options (in Shares) 563,000 563,000          
Exercise of stock options   $ 2 $ 5,802     $ 5,804  
Tax benefit from exercise of options     4,277     4,277  
Tax Benefit from Stock Based Compensation $ 4,277            
Issuance of fully vested restricted stock (in Shares) 582,000            
Stock-based compensation $ 20,141   $ 20,141     20,141  
Unrealized holding gain on marketable securities net of taxes         $ (3,468) (3,468)  
Unrealized Gain (Loss) on Cash Flow Hedging Instruments         (370) (370)  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (775)         (775)  
Net loss attributable to noncontrolling interests 1,278            
Foreign currency translation adjustment         $ (4,282) (4,282)  
Net income $ 133,285     $ 132,007   133,285  
Balance (in Shares) at Dec. 31, 2012   69,191,000          
Balance (in Shares) at Dec. 31, 2013 67,336,000            
Balance at Dec. 31, 2013           678,840  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock Repurchased During Period, Shares   3,000,000         (3,000,000)
Payments for Repurchase of Common Stock $ (102,172)         (102,172) $ (102,172)
Accumulated other comprehensive loss $ (6,677)            
Treasury Stock, Shares 15,605,000            
Treasury Stock, Value $ (234,715)            
Non-controlling interests 323            
Common stock – $.0001 par value, 135,000 shares authorized, 85,263 and 83,491 shares issued, 61,693 and 63,625 shares outstanding 7            
Additional paid-in capital 247,858            
Retained earnings $ 672,044            
Exercise of stock options (in Shares) 340,000            
Exercise of stock options $ 4,943            
Tax benefit from exercise of options 2,978            
Tax Benefit from Stock Based Compensation $ 2,978            
Issuance of fully vested restricted stock (in Shares) 210,000            
Stock-based compensation $ 19,260            
Unrealized holding gain on marketable securities net of taxes 1,441            
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (1,278)            
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (946)            
Noncontrolling Interest, Increase from Business Combination 128            
Net loss attributable to noncontrolling interests 749            
Foreign currency translation adjustment (6,238)            
Net income $ 112,629     111,880      
Balance (in Shares) at Dec. 31, 2014 63,625,000            
Balance at Dec. 31, 2014 $ 669,529         669,529  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock Repurchased During Period, Shares (4,261,000)            
Payments for Repurchase of Common Stock $ (142,228)           (142,227)
Payments for Repurchase of Common Stock 1            
Accumulated other comprehensive loss $ (12,752)            
Treasury Stock, Shares 19,866,000            
Treasury Stock, Value $ (376,942)            
Non-controlling interests 274            
Common stock – $.0001 par value, 135,000 shares authorized, 85,263 and 83,491 shares issued, 61,693 and 63,625 shares outstanding 6            
Noncontrolling Interest in Operating Partnerships 148            
Additional paid-in capital 275,039            
Retained earnings $ 783,904            
Exercise of stock options (in Shares) 1,460,000            
Exercise of stock options $ 21,301            
Tax benefit from exercise of options $ 10,510            
Issuance of fully vested restricted stock (in Shares) 312,000            
Stock-based compensation $ 18,698            
Unrealized holding gain on marketable securities net of taxes (1,173)            
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1,246            
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (732)            
Noncontrolling Interest, Increase from Business Combination 0            
Net loss attributable to noncontrolling interests 717            
Foreign currency translation adjustment (18,734)            
Net income $ 113,655     $ 112,938      
Balance (in Shares) at Dec. 31, 2015 61,693,000            
Balance at Dec. 31, 2015 $ 678,663         $ 678,663  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock Repurchased During Period, Shares (3,704,000)            
Payments for Repurchase of Common Stock $ (135,637)           $ (135,637)
Payments for Repurchase of Common Stock 0            
Accumulated other comprehensive loss $ (31,413)            
Treasury Stock, Shares 23,570,000            
Treasury Stock, Value $ (512,579)            
Non-controlling interests 259            
Common stock – $.0001 par value, 135,000 shares authorized, 85,263 and 83,491 shares issued, 61,693 and 63,625 shares outstanding 6            
Additional paid-in capital 325,548            
Retained earnings 896,842            
Noncontrolling Interest in Operating Partnerships $ (20)