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Equity Transactions and Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2015
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 2016, our Board of Directors approved the grant of the following awards, each with a three-year vesting term:
 
Number of Shares or Units
Stock options
905,966

Restricted stock unit awards
225,834
 
1,131,800

 
 
Phantom stock unit awards
1,268,068
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 years ended December 31, 2015, 2014 and 2013 (amounts in thousands):
 
Year ended December 31,
 
2015
 
2014
 
2013
Stock option awards
$
923

 
$
1,275

 
$
1,771

Restricted stock awards
399

 
548

 
576

Restricted stock unit awards
2,307

 
5,794

 
4,024

 
$
3,629

 
$
7,617

 
$
6,371
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
The following table summarizes the unrecognized compensation cost (amounts in thousands) to be recognized for stock options, restricted stock and restricted stock unit awards, and the weighted-average period remaining (in years) over which the compensation cost is expected to be recognized, as of December 31, 2015:
 
Weighted-Average Period Remaining
 
Unrecognized Compensation Cost
Stock options
0.84
 
$
452

Restricted stock awards
0.39
 
137

Restricted stock unit awards
1.20
 
3,417

 

 
$
4,006
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 years ended December 31, 2015, 2014 and 2013:
 
Year ended December 31,
 
2015
 
2014
 
2013
Expected volatility
64
%
 
66
%
 
66
%
Risk-free interest rates
1.4
%
 
1.7
%
 
1.0
%
Expected life in years
5.52

 
5.49

 
5.53

Grant-date fair value
$2.31
 
$4.87
 
$4.36
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table represents stock option activity from December 31, 2013 through December 31, 2015:
 
Number of
Shares
 
Weighted-Average
Exercise Price
Per Share
 
Weighted-Average
Remaining Contract
Life in Years
Outstanding stock options as of December 31, 2013
5,532,213
 
$10.18
 
 
Granted
221,440
 
8.44
 
 
Forfeited
(155,100)
 
14.82
 
 
Exercised
(928,777)
 
9.01
 
 
Outstanding stock options as of December 31, 2014
4,669,776
 
$10.18
 
 
Granted
341,638
 
4.12
 
 
Forfeited
(586,160)
 
13.18
 
 
Exercised
(203,300)
 
3.84
 
 
Outstanding stock options as of December 31, 2015
4,221,954
 
$9.58
 
4.3
Stock options exercisable as of December 31, 2015
3,707,800
 
$10.13
 
3.8
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
The following table summarizes our nonvested stock option activity from December 31, 2013 through December 31, 2015:
 
Number of
Shares
 
Weighted-Average Grant-Date
Fair Value Per Share
Nonvested stock options as of December 31, 2013
757,041
 
$4.74
Granted
221,440
 
4.87
Vested
(433,211)
 
4.77
Nonvested stock options as of December 31, 2014
545,270
 
$4.77
Granted
341,638
 
2.31
Vested
(364,721)
 
4.70
Forfeited
(8,033)
 
5.23
Nonvested stock options as of December 31, 2015
514,154
 
$3.19
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
The following table summarizes our restricted stock activity from December 31, 2013 through December 31, 2015:
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Value per Share
Nonvested restricted stock as of December 31, 2013
105,204
 
$8.18
Granted
32,100
 
14.33
Vested
(88,620)
 
8.20
Nonvested restricted stock as of December 31, 2014
48,684
 
$12.20
Granted
47,296
 
7.40
Vested
(48,684)
 
12.19
Nonvested restricted stock as of December 31, 2015
47,296
 
$7.41
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 our restricted stock unit activity from December 31, 2013 through December 31, 2015:
 
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, 2013
627,712

 
$7.93
 
673,762

 
$9.19
Granted
360,665

 
8.64
 
400,503

 
9.67
Achieved performance adjustment
—

 
—

 
22,091

 
10.23

Vested
(267,430)

 
8.16

 
(155,647
)
 
10.23

Forfeited
(45,868)

 
8.07
 
(78,897)

 
9.30
Nonvested restricted stock units as of
December 31, 2014
675,079

 
$8.21
 
861,812

 
$9.24
       Granted
151,919

 
4.08
 
634,272

 
6.66
Achieved performance adjustment
—

 
—

 
(68,299
)
 
9.85

Vested
(340,225)

 
8.11
 
(227,454
)
 
9.29

       Forfeited
(100,240)

 
7.21
 
(243,036)

 
8.87
Nonvested restricted stock units as of
December 31, 2015
386,533

 
$6.93
 
957,295

 
$7.57