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Equity Transactions and Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-Based Compensation, Awards Issued During Period [Table Text Block]
In January 2018, our Board of Directors approved the grant of the following awards:
 
Vesting Period
 
Number of Shares or Units
Restricted stock unit awards
3 years
 
788,377
Phantom stock unit awards
39 months
 
1,188,216
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 the years ended December 31, 2017, 2016 and 2015 (amounts in thousands):
 
Year ended December 31,
 
2017
 
2016
 
2015
Stock option awards
$
974

 
$
766

 
$
923

Restricted stock awards
461

 
421

 
399

Restricted stock unit awards
2,914

 
2,757

 
2,307

 
$
4,349

 
$
3,944

 
$
3,629

 
 
 
 
 
 
Phantom stock unit awards
$
1,609

 
$
1,971

 
$
—
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
The following table summarizes the unrecognized compensation cost (amounts in thousands) to be recognized and the weighted-average period remaining (in years) over which the compensation cost is expected to be recognized, by award type, as of December 31, 2017:
 
Weighted-Average Period Remaining
 
Unrecognized Compensation Cost
Stock options
0.66
 
$
599

Restricted stock awards
0.38
 
174

Restricted stock unit awards
1.32
 
3,655

Phantom stock unit awards
1.33
 
2,491

 

 
$
6,919
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 the years ended December 31, 2017, 2016 and 2015:
 
Year ended December 31,
 
2017
 
2016
 
2015
Expected volatility
76
%
 
70
%
 
64
%
Risk-free interest rates
2.1
%
 
1.5
%
 
1.4
%
Expected life in years
5.86

 
5.70

 
5.52

Grant-date fair value
$4.28
 
$0.80
 
$2.31
Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes our stock option activity from December 31, 2016 through December 31, 2017:
 
Number of
Shares
 
Weighted-Average
Exercise Price
Per Share
 
Weighted-Average
Remaining 
Contract Term in Years
 
Aggregate Intrinsic Value (in thousands)(1)
Outstanding stock options as of December 31, 2016
4,384,425
 
$7.42
 
 
 
 
Granted
268,185
 
6.40
 
 
 
 
Forfeited
(382,700)
 
13.82
 
 
 
 
Outstanding stock options as of December 31, 2017
4,269,910
 
$6.78
 
4.5
 
$1,576
 
 
 
 
 
 
 
 
Stock options exercisable as of December 31, 2017
3,288,463
 
$7.90
 
3.4
 
$525
 
 
 
 
 
 
 
 
(1) Intrinsic value is the amount by which the market price of our common stock exceeds the exercise price of the stock options.
Schedule of Share-based Payment Award, Options, Exercised, Intrinsic Value [Table Text Block]
The following table presents the aggregate intrinsic value of stock options exercised during the years ended December 31, 2017, 2016 and 2015 (amounts in thousands):
 
Year ended December 31,
 
2017
 
2016
 
2015
Aggregate intrinsic value of stock options exercised
$
—

 
$
12

 
$
361
Schedule of Share-based Compensation, Restricted Stock Awards, Grants in Period Fair Value and Vests in Period Intrinsic Value [Table Text Block]
The following table presents the weighted-average grant-date fair value per share of restricted stock awards granted and the aggregate fair value of restricted stock awards vested during the years ended December 31, 2017, 2016 and 2015:
 
Year ended December 31,
 
2017
 
2016
 
2015
Grant-date fair value (per share)
$
2.75

 
$
2.76

 
$
7.40

Aggregate fair value of awards vested (in thousands)
$
483

 
$
137

 
$
368
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following table summarizes our restricted stock unit activity from December 31, 2016 through December 31, 2017:
 
Time-Based Award
 
Performance-Based Award
 
Number of
Time-Based
Award Units
 
Weighted-Average
Grant-Date
Fair Value 
per Unit
 
Number of
Performance-Based
Award Units
 
Weighted-Average
Grant-Date
Fair Value 
per Unit
Nonvested restricted stock units as of
December 31, 2016
397,790

 
$3.45
 
685,817

 
$7.28
       Granted
96,728

 
5.61
 
563,469

 
7.75

Achieved performance adjustment
—

 
—

 
54,429

 
9.66

Vested
(202,387)

 
4.90
 
(317,598
)
 
9.66

       Forfeited
(40,245)

 
2.66
 
—

 
—

Nonvested restricted stock units as of
December 31, 2017
251,886

 
$3.24
 
986,117

 
$6.91
Schedule of Share-based Compensation, Restricted Stock Units Award Activity, Weighted Average Grant Date and Vested in Period, Fair Value [Table Text Block]
The following table presents the weighted-average grant-date fair value per share of restricted stock units granted and the aggregate intrinsic value of restricted stock units vested (converted) during the years ended December 31, 2017, 2016 and 2015:
 
Year ended December 31,
 
2017
 
2016
 
2015
Time-based RSUs:
 
 
 
 
 
Grant-date fair value of awards granted (per share)
$
5.61

 
$
1.47

 
$
4.08

Aggregate intrinsic value of awards vested (in thousands)
$
1,206

 
$
314

 
$
1,575

Performance-based RSUs:
 
 
 
 
 
Grant-date fair value of awards granted (per share)
$
7.75

 
$
—

 
$
6.66

Aggregate intrinsic value of awards vested (in thousands)
$
969

 
$
609

 
$
1,402
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes our nonvested stock option activity from December 31, 2016 through December 31, 2017:
 
Number of
Shares
 
Weighted-Average Grant-Date
Fair Value Per Share
Nonvested stock options as of December 31, 2016
1,186,917
 
$1.29
Granted
268,185
 
4.28
Vested
(473,655)
 
1.69
Nonvested stock options as of December 31, 2017
981,447
 
$1.91
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes our restricted stock activity from December 31, 2016 through December 31, 2017:
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Value per Share
Nonvested restricted stock as of December 31, 2016
166,664
 
$2.76
Granted
167,272
 
2.75
Vested
(166,664)
 
2.76
Nonvested restricted stock as of December 31, 2017
167,272
 
$2.75