Equity Incentive Plan (Tables)

6 Months Ended

Jun. 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	(87,896	)	17.41
Forfeited	(3,968	)	25.94
Expired	(282	)	15.23
Options outstanding, June 30, 2015	665,949		$	21.38

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	(3,968	)	8.05
Vested	(163,392	)	6.82
Unvested balance, June 30, 2015	116,604		$	9.03

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	183,710		47.39
Forfeited	(22,145	)	34.54
Vested	(158,815	)	26.76
Unvested balance, June 30, 2015	396,766		$	38.20

Summary of assumptions used to value performance stock awards

	Six Months Ended June 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	%