Equity Transactions and Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2016

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 for stock option, restricted stock and restricted stock unit awards, and the compensation expense recognized for phantom stock unit awards during thethree and six months ended June 30, 2016 and 2015 (amounts in thousands):

	Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015
Stock option awards	$	188	$	213	$	381	$	477
Restricted stock awards	103		99		190		223
Restricted stock unit awards	597		523		1,494		540
	$	888	$	835	$	2,065	$	1,240
Phantom stock unit awards	$	608	$	—	$	726	$	—

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 thesix months ended June 30, 2016 and 2015:

	Six months ended June 30,
	2016		2015
Expected volatility	70	%	64	%
Risk-free interest rates	1.5	%	1.4	%
Expected life in years	5.70		5.52
Options granted	905,966		341,638
Grant-date fair value	$0.80		$2.31

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 unit awards granted during the three and six months ended June 30, 2016 and 2015:

	Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015
Time-based RSUs:
Time-based RSUs granted	28,500		—		260,334		151,919
Weighted-average grant-date fair value	$	2.88	$	—	$	1.48	$	4.08
Performance-based RSUs:
Performance-based RSUs granted	—		145,107		—		439,773
Weighted-average grant-date fair value	$	—	$	8.34	$	—	$	5.76