Equity Transactions and Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2014

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 compensation expense recognized for stock option, restricted stock and restricted stock unit awards during the three and six months ended June 30, 2014 and 2013 (amounts in thousands):

	Three months ended June 30,				Six months ended June 30,
	2014		2013		2014		2013
Stock option awards	$	310	$	421	$	653	$	947
Restricted stock awards	141		130		294		263
Restricted stock unit awards	1,520		1,001		2,880		1,854
	$	1,971	$	1,552	$	3,827	$	3,064

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 six months ended June 30, 2014 and 2013:

	Six months ended June 30,
	2014		2013
Expected volatility	66	%	66	%
Risk-free interest rates	1.7	%	1.0	%
Expected life in years	5.49		5.53
Options granted	221,440		220,656
Grant-date fair value	$4.87		$4.36

Restricted Stock Units (RSUs) [Member]

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

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 six months ended June 30, 2014 and the three and six months ended June 30, 2013:

	Three months ended June 30,		Six months ended June 30,
	2013		2014		2013
Time-based RSUs:
Time-based RSUs granted	252,749		347,335		406,027
Weighted-average grant-date fair value	$	7.54	$	8.44	$	7.59
Performance-based RSUs:
Performance-based RSUs granted	295,873		321,606		346,731
Weighted-average grant-date fair value	$	8.33	$	9.90	$	8.34