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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Stock-Based Compensation [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
Expected Volatility
 
Risk-free Interest Rate
 
Expected Term
 
Dividend
Rate
March 31, 2016:
 
 
 
 
 
 
 
 
Employees
 
63
%
 
1.1
%
 
4
 
—
%
Officers and non-employee directors
 
83
%
 
1.6
%
 
8
 
—
%
March 31, 2015:
 
 
 
 
 
 
 
 
Employees
 
63
%
 
1.2
%
 
4
 
—
%
Officers and non-employee directors
 
81
%
 
1.9
%
 
8
 
—
%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Options
 
Weighted Average Exercise Price
 
 
(in thousands)
 
 
Outstanding at December 31, 2015
 
4,217

 
$
12.35

Granted
 
934

 
8.47

Exercised
 
(7
)
 
11.59

Expired
 
(157
)
 
27.03

Forfeited
 
(9
)
 
8.49

Outstanding at March 31, 2016
 
4,978

 
11.17

Exercisable at March 31, 2016
 
2,829

 
$
13.12
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
 
 
Shares
 
Weighted Average Grant Date
Fair Value
 
 
(in thousands)
 
 
Outstanding at December 31, 2015
 
637

 
$
8.74

Granted
 
496

 
8.20

Vested
 
(206
)
 
9.75

Forfeited
 
(31
)
 
11.06

Nonvested at March 31, 2016
 
896

 
$
8.12