Employee Benefits and Share-Based Compensation - Stock Option Activity (Details) - 2009 Plan - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Outstanding at December 31, 2015	2,688
Granted (Awarded)	1,055
Exercised (Released)	(406)
Expired	(8)
Forfeited	(115)
Outstanding at December 31, 2016	3,214	2,688
Exercisable at December 31, 2016	1,487
Vested and expected to vest at December 31, 2016 and thereafter	3,007
Weighted-Average Exercise Price
Outstanding at December 31, 2015	$ 22.89
Granted (Awarded)	32.11
Exercised (Released)	19.58
Expired	30.43
Forfeited	30.19
Outstanding at December 31, 2016	26.06	$ 22.89
Exercisable at December 31, 2016	20.23
Vested and expected to vest at December 31, 2016 and thereafter	$ 25.66
Outstanding at December 31 (in years)	7 years 3 months	6 years 11 months
Exercisable at December 31, 2014 (in years)	5 years 5 months
Vested and expected to vest at December 31, 2014 (in years)	7 years 2 months
Outstanding at December 31, 2016	$ 26,331
Exercisable at December 31, 2016	20,459
Vested and expected to vest at December 31, 2016 and thereafter	$ 25,778
Employee Stock Option
Weighted-Average Exercise Price
Weighted-average fair value (in usd per share)	$ 9.33	$ 9.67	$ 9.12
Intrinsic value of options exercised	$ 5,600	$ 11,300	$ 14,100
Unrecognized compensation cost of unvested stock options	$ 13,300	$ 11,200
Weighted average period of compensation cost recognized	3 years	2 years 11 months