Stock-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

The following table summarizes the stock-based compensation expense recognized, by award type, and the compensation expense recognized for phantom stock unit awards during thethree and nine months ended September 30, 2017 and 2016 (amounts in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017		2016
Stock option awards	$	249	$	192	$	726	$	573
Restricted stock awards	116		116		345		306
Restricted stock unit awards	525		625		2,154		2,119
	$	890	$	933	$	3,225	$	2,998
Phantom stock unit awards	$	878	$	307	$	397	$	1,033

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table summarizes the assumptions used in the Black-Scholes option pricing model based on a weighted-average calculation for the options granted during thenine months ended September 30, 2017 and 2016:

	Nine months ended September 30,
	2017		2016
Expected volatility	76	%	70	%
Risk-free interest rates	2.1	%	1.5	%
Expected life in years	5.86		5.70
Options granted	268,185		905,966
Grant-date fair value	$4.28		$0.80

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

The following table summarizes the number and weighted-average grant-date fair value of the restricted stock and restricted stock unit awards granted during the nine months ended September 30, 2017 and 2016:

	Nine months ended September 30,
	2017		2016
Restricted Stock:
Restricted stock awards granted	167,272		166,664
Weighted-average grant-date fair value	$	2.75	$	2.76
Time-based RSUs:
Time-based RSUs granted	96,728		260,334
Weighted-average grant-date fair value	$	5.61	$	1.48
Performance-based RSUs:
Performance-based RSUs granted	563,469		—
Weighted-average grant-date fair value	$	7.75	$	—