Equity Incentive Plan (Tables)

9 Months Ended

Sep. 30, 2015

Equity Incentive Plan

Schedule of stock option activity

	Number of Shares Subject to Options		Weighted- Average Exercise Price
Options outstanding, December 31, 2014	758,095		$	20.94
Granted	—		—
Exercised	(400,585	)	20.08
Forfeited	(7,281	)	27.53
Expired	(282	)	15.23
Options outstanding, September 30, 2015	349,947		$	21.80

Schedule of unvested shares subject to options

	Number of Shares Subject to Options		Weighted- Average Fair Value at Grant Date
Unvested balance, December 31, 2014	283,964		$	7.75
Granted	—		—
Forfeited	(7,281	)	8.48
Vested	(170,456	)	6.87
Unvested balance, September 30, 2015	106,227		$	9.09

Schedule of restricted awards and RSUs

	Restricted Awards		Weighted- Average Fair Value at Grant Date
Unvested balance, December 31, 2014	394,016		$	29.10
Granted	184,532		47.40
Forfeited	(33,837	)	36.05
Vested	(166,230	)	27.06
Unvested balance, September 30, 2015	378,481		$	38.29

Summary of assumptions used to value performance stock awards

	Nine Months Ended September 30,
	2015		2014
Expected term (in years)	2.83		2.83
Expected volatility	25.51	%	32.98	%
Expected annual dividend	—		—
Risk-free rate	1.02	%	0.64	%