Equity Incentive Plan (Tables)

3 Months Ended

Mar. 31, 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	(20,287	)	22.13
Forfeited	(562	)	15.23
Expired	(282	)	15.23
Options outstanding, March 31, 2015	736,964		$	20.91

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	(562	)	4.89
Vested	(116,780	)	6.43
Unvested balance, March 31, 2015	166,622		$	8.67

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	176,697		47.49
Forfeited	(2,749	)	28.17
Vested	(111,143	)	27.24
Unvested balance, March 31, 2015	456,821		$	36.67

Summary of assumptions used to value performance stock awards

	Three Months Ended March 31,
	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	%