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Stock-Based Compensation (Summary of All Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Shares  
Options outstanding at beginning of period, Shares | shares 24,999,665
Granted, Shares | shares 288,120
Exercised, Shares | shares (2,297,358)
Forfeited, Shares | shares (141,021)
Options outstanding at end of period, Shares | shares 22,849,406
Exercisable at end of period, Shares | shares 16,456,810
Weighted Average Exercise Price  
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 4.91
Granted (in dollars per share) | $ / shares 20.16
Exercised (in dollars per share) | $ / shares 4.29
Forfeited (in dollars per share) | $ / shares 7.23
Options outstanding at end of period (in dollars per share) | $ / shares 5.15
Exercisable at end of period (in dollars per share) | $ / shares $ 4.02
Options outstanding at end of period, Weighted Average Remaining Contractual Term 4 years 5 months 15 days
Exercisable at end of period, Weighted Average Remaining Contractual Term 3 years 11 months 8 days
Options outstanding at end of period, Aggregate Intrinsic Value, in dollars | $ $ 377,392
Exercisable at end of period, Aggregate Intrinsic Value, in dollars | $ $ 290,400