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Stockholders' Equity - Summary of Amounts Related to Option Exercises (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]    
Total intrinsic value of options exercised $ 31,457 $ 80,838
Cash received from options exercised $ 3,536 $ 10,916