Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes our compensation costs recognized in General and administrative expense under the Incentive Plan and Stock Purchase Plan (in thousands):

	Years Ended December 31,
	2016		2015		2014
Restricted Stock Awards	$	2,975	$	3,692	$	4,840
Restricted Stock Units	$	1,255	$	—	$	—
Stock Option Awards	$	2,352	$	1,477	$	188

Schedule Of Equity Incentive Plan Disclosures

The following table summarizes our restricted stock activity (in thousands, except per share amounts):    

	Shares		Weighted- Average Grant Date Fair Value
Unvested balance at December 31, 2015	438		$	18.84
Granted	251		17.32
Vested	(207	)	18.83
Forfeited	(46	)	17.48
Unvested balance at December 31, 2016	436		$	17.83

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

The weighted-average assumptions used to measure stock options granted during 2016 , 2015 and 2014 are presented below.

	2016	2015	2014
Expected life from date of grant (years)	4.4	6.4	5.0
Expected volatility	39.8%	35.0%	35.0%
Expected dividend yield	—%	—%	—%
Risk-free interest rate	1.16%	1.81%	1.76%

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes our stock option activity (in thousands, except per share amounts):

	Number of Options		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term in Years	Aggregate Intrinsic Value
Outstanding balance at January 1, 2016	641		$	17.77	4.9	$	2.5
Issued	1,105		21.49
Forfeited / canceled	(3	)	15.15
Outstanding balance at December 31, 2016	1,743		$	20.13	6.2	$	—
Exercisable, end of year	683		$	18.64	4.8	$	—