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Equity Transactions and Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 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 years ended December 31, 2014, 2013 and 2012 (amounts in thousands):
 
Year ended December 31,
 
2014
 
2013
 
2012
Stock option awards
$
1,275

 
$
1,771

 
$
2,962

Restricted stock awards
548

 
576

 
628

Restricted stock unit awards
5,794

 
4,024

 
3,729

 
$
7,617

 
$
6,371

 
$
7,319
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, 2014, 2013 and 2012:
 
Year ended December 31,
 
2014
 
2013
 
2012
Expected volatility
66
%
 
66
%
 
70
%
Risk-free interest rates
1.7
%
 
1.0
%
 
0.8
%
Expected life in years
5.49

 
5.53

 
5.12

Grant-date fair value
$4.87
 
$4.36
 
$5.02
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table represents stock option activity from December 31, 2012 through December 31, 2014:
 
Number of
Shares
 
Weighted-Average
Exercise Price
Per Share
 
Weighted-Average
Remaining Contract
Life in Years
Outstanding stock options as of December 31, 2012
5,649,991
 
$10.09
 
 
Granted
220,656
 
7.58
 
 
Forfeited
(67,500)
 
16.02
 
 
Exercised
(270,934)
 
4.67
 
 
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
 
4.7
Stock options exercisable as of December 31, 2014
4,124,506
 
$10.42
 
4.2
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, 2012 through December 31, 2014:
 
Number of
Shares
 
Weighted-Average Grant-Date
Fair Value Per Share
Nonvested stock options as of December 31, 2012
1,130,844
 
$4.89
Granted
220,656
 
4.36
Vested
(594,459)
 
4.88
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
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, 2012 through December 31, 2014:
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Value per Share
Nonvested restricted stock as of December 31, 2012
142,820
 
$8.67
Granted
61,248
 
7.51
Vested
(98,864)
 
8.47
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
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, 2012 through December 31, 2014:
 
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, 2012
531,526

 
$9.16
 
355,051

 
$9.99
Granted
406,027

 
7.59
 
346,731

 
8.34
Vested
(254,629)

 
9.82

 
—

 
—

Forfeited
(55,212)

 
8.60
 
(28,020)

 
8.81
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