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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		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Number of Shares
Outstanding at beginning of period (in shares)			3,323
Granted (in shares)			720
Exercised (in shares)			(356)
Expired (in shares)			(6)
Forfeited (in shares)			(172)
Outstanding at end of period (in shares)	3,509		3,509		3,323
Exercisable at end of period (in shares)	1,338		1,338
Vested and expected to vest at end of period (in shares)	3,303		3,303
Weighted Average Exercise Price
Outstanding beginning balance (in dollars per share)			$ 32.72
Granted (in dollars per share)			44.73
Exercised (in dollars per share)			24.15
Expired (in dollars per share)			21.92
Forfeited (in dollars per share)			38.13
Outstanding ending balance (in dollars per share)	$ 35.80		35.80		$ 32.72
Exercisable at end of period (in dollars per share)	26.29		26.29
Vested and expected to vest at end of period (in dollars per share)	$ 35.34		$ 35.34
Weighted-average remaining years, outstanding			7 years 7 months 21 days		7 years 7 months 13 days
Weighted-average remaining years, exercisable at end of period			5 years 6 months 29 days
Weighted-average remaining years, vested and expected to vest at at end of period			7 years 6 months 18 days
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding at end of period	$ 58,487		$ 58,487		$ 53,953
Aggregate intrinsic value, exercisable at end of period	35,014		35,014
Aggregate intrinsic value, vested and expected to vest at end of period	$ 56,583		$ 56,583
Weighted-average fair value (in dollars per share)	$ 14.43	$ 11.31	$ 14.29	$ 10.92
Intrinsic value of options exercised	$ 6,500	$ 4,900	$ 8,500	$ 7,800
Unrecognized compensation cost of unvested stock options	$ 23,700		$ 23,700
Weighted average period of compensation cost not yet recognized (in years)			2 years 11 months 9 days

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