Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Stock-based compensation expense was recognized in the Consolidated Statements of Operations as follows:



	Year Ended December 31,
	2017		2016		2015
	(In thousands)
General and administrative expense	$	1,138	$	2,394	$	1,611
	$	1,138	$	2,394	$	1,611

Assumptions used in the valuation of options granted in each period were as follows:



	Year Ended December 31,
	2017		2016		2015
Service-Based Options
Dividend yield	0	%	0	%	0	%
Expected volatility	22	%	25	%	26	%
Average expected option life	5 years		5 years		5 years
Risk-free interest rate	2.1	%	1.5	%	1.5	%

Option activity of the Company is summarized below:



	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
	(In thousands)				(In years)	(In thousands)
Outstanding at December 31, 2014	1,316		$	12.81
Options granted	31		17.26
Options exercised	(155	)	13.12
Options canceled/forfeited	(107	)	13.06
Outstanding at December 31, 2015	1,085		12.86
Options granted	27		13.03
Options exercised	(170	)	7.56
Options canceled/forfeited	(264	)	11.06
Outstanding at December 31, 2016	678		14.90
Options granted	8		11.33
Options exercised	(29	)	10.16
Options canceled/forfeited	(88	)	17.20
Outstanding at December 31, 2017	569		14.74		3.71	$	80
Options exercisable at December 31, 2017	198		15.67		2.65	—
Shares available for future grant	1,884

Deferred stock unit, performance-based stock unit and restricted stock activity are summarized below:



	Shares		Weighted Average Grant Date Fair Value
	(In thousands)
Unvested at December 31, 2015	670		$	16.16
Granted	413		13.27
Vested	(89	)	16.46
Forfeited	(61	)	17.08
Unvested at December 31, 2016	933		14.79
Granted	217		11.43
Vested	(135	)	13.75
Forfeited	(10	)	14.38
Unvested at December 31, 2017	1,005		14.21