Employee Benefit Plans - Summary of Stock Options Activity (Details) - Stock Options - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Number of Stock Options
Options outstanding as of January 1, 2016 (in shares)	5,375,476
Granted	0
Exercised	(14,405)
Canceled or forfeited	(2,675)
Options outstanding as of March 31, 2016 (in shares)	5,358,396
Options exercisable as of March 31, 2016	3,766,337
Expected to vest as of March 31, 2016	1,301,667
Weighted Average Exercise Price
Options outstanding as of January 1, 2016 (in dollars per share)	$ 16.04
Granted	0.00
Exercised	14.90
Canceled or forfeited	23.23
Options outstanding as of March 31, 2016 (in dollars per share)	16.04
Options exercisable as of March 31, 2016	13.13
Expected to vest as of March 31, 2016	23.09
Weighted average grant date fair value of stock options	$ 0.00	$ 9.44