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Stockholders' Equity - Summary of Assumptions Used to Value Stock Option Grants Using Lattice-Binomial Model (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]    
Dividend yield 0.00% 0.00%
Expected volatility 50.00% 36.00%
Risk-free interest rate 2.04% 2.03%
Suboptimal exercise factor 2.48 2.48
Weighted-average fair value (in dollars per share) | $ / shares $ 50.76 $ 26.46
Stock-based compensation expense $ 42,422 $ 27,441
Total income tax impact on provision (in thousands) $ 15,963 $ 10,392