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Stockholders' Equity, Stock Option Activity (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares [Abstract]      
Outstanding at beginning of period (in shares) 8,041    
Granted (in shares) 2,428    
Exercised (in shares) (994)    
Cancelled/forfeited/expired (in shares) (297)    
Outstanding at end of period (in shares) 9,178 8,041  
Exercisable at end of period (in shares) 4,898    
Weighted Average Exercise Price Per Share [Abstract]      
Outstanding at beginning of period (in dollars per share) $ 33.21    
Granted (in dollars per share) 54.79    
Exercised (in dollars per share) 12.63    
Cancelled/forfeited/expired (in dollars per share) 53.65    
Outstanding at end of period (in dollars per share) 40.48 $ 33.21  
Exercisable at end of period (in dollars per share) $ 28.73    
Average Remaining Contractual Term, Aggregate Intrinsic Value and Other [Abstract]      
Average remaining contractual term, outstanding at end of period 4 years 5 months 16 days    
Average remaining contractual term, exercisable at end of period 3 years 4 months 24 days    
Aggregate intrinsic value, outstanding at end of period $ 122,738    
Aggregate intrinsic value, exercisable at end of period $ 107,969    
Weighted average fair value of options granted (in dollars per share) $ 26.72 $ 27.44 $ 17.54
Intrinsic value of options exercised $ 28,000 $ 84,700 $ 62,800
Cash received from exercise of stock options $ 12,600 $ 23,600 $ 22,400
Weighted-average fair value of options exercised (in dollars per share) $ 40.83    
Unrecognized Compensation Expense [Abstract]      
Unrecognized compensation expense related to non-vested stock options $ 48,100    
Weighted average period for recognition 1 year 1 month 6 days