Stockholder's Equity (Tables)

6 Months Ended

Jun. 30, 2015

Stockholder's equity

Summary of stock option activity

The following table summarizes stock option activity for the six months ended June 30, 2015 (shares and intrinsic value in thousands):

	Number of shares	Weighted-average exercise price		Weighted-average remaining contractual term	Aggregate intrinsic value
Outstanding at December 31, 2014	1,870	$	11.23	8.4	$	4,721
Granted	75	13.30		—	—
Exercised	—	—		—	—
Forfeited	—	—		—	—
Expired	—	—		—	—
Outstanding at June 30, 2015	1,945	$	11.31	7.9	$	2,296
Vested at June 30, 2015	1,027	$	11.30	7.7	$	1,296
Exercisable at June 30, 2015	1,027	$	11.30	7.7	$	1,296

Summary of restricted share activity

The following table summarizes restricted share activity for the six months ended June 30, 2015 (shares in thousands):

	Number of shares		Weighted-average grant date fair value
Outstanding at December 31, 2014	719		$	9.82
Granted	74		12.10
Vested	(304	)	10.53
Forfeited	—		—
Outstanding at June 30, 2015	489		$	9.72

Time Based Stock Option | Black Scholes Pricing Model

Equity Incentive Plans

Schedule of valuation assumptions

Black-Scholes Option Valuation Assumptions	Six Months Ended June 30, 2015	2014
Risk-free interest rate	1.77% - 2.12%	1.76%-1.92%
Dividend yield	—	—
Volatility	26.2% - 29.5%	28.4%-30.9%
Weighted-average expected term (years)	6.7	6.0-6.3