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Employee Benefits and Share-Based Compensation - Stock Option Activity (Details) - 2009 Plan - Employee stock option - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Number of Shares
Outstanding at beginning of period (in shares)			3,323
Granted (in shares)			937
Exercised (in shares)			(584)
Expired (in shares)			(12)
Forfeited (in shares)			(228)
Outstanding at end of period (in shares)	3,436		3,436		3,323
Exercisable at end of period (in shares)	1,247		1,247
Vested and expected to vest at end of period (in shares)	3,240		3,240
Weighted Average Exercise Price
Outstanding beginning balance (in dollars per share)			$ 32.72
Granted (in dollars per share)			47.36
Exercised (in dollars per share)			24.63
Expired (in dollars per share)			23.38
Forfeited (in dollars per share)			38.85
Outstanding ending balance (in dollars per share)	$ 37.71		37.71		$ 32.72
Exercisable at end of period (in dollars per share)	27.44		27.44
Vested and expected to vest at end of period (in dollars per share)	$ 37.24		$ 37.24
Weighted-average remaining years, outstanding			7 years 8 months 12 days		7 years 7 months 6 days
Weighted-average remaining years, exercisable at end of period			5 years 8 months 12 days
Weighted-average remaining years, vested and expected to vest at at end of period			7 years 7 months 6 days
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding at end of period	$ 117,493		$ 117,493		$ 53,953
Aggregate intrinsic value, exercisable at end of period	55,462		55,462
Aggregate intrinsic value, vested and expected to vest at end of period	$ 112,292		$ 112,292
Weighted-average fair value (in dollars per share)	$ 17.45	$ 12.49	$ 15.02	$ 11.22
Intrinsic value of options exercised	$ 8,200	$ 6,800	$ 16,700	$ 14,600
Unrecognized compensation cost of unvested stock options	$ 24,500		$ 24,500
Weighted average period of compensation cost not yet recognized (in years)			2 years 10 months 24 days

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