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Stock-Based Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Other Share-based Compensation, Activity [Table Text Block]
Compensation expense for the periods presented was comprised of the following:
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
Restricted stock awards with time-based service conditions
 
$
1,025

 
$
4,071

 
$
10,575

Restricted stock unit awards with time-based service conditions
 
161

 
320

 
473

Restricted stock awards with performance-based vesting conditions
 
121

 
197

 
—

Stock options with time-based service vesting conditions
 
2,165

 
1,316

 
—

Stock options with market-based vesting conditions
 
2,372

 
3,158

 
—

Stock options with performance-based vesting conditions
 
—

 
—

 
—

Profits interests units
 
3,041

 
—

 
—

Total compensation expense
 
$
8,885

 
$
9,062

 
$
11,048
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period [Text Block]
Stock-based award grant activity for the periods presented was as follows:
 
 
2017
 
2016
 
 
Shares
 
Aggregate fair value (in thousands)
 
Shares
 
Aggregate fair value (in thousands)
Restricted stock awards with performance-based vesting conditions
 
—

 
$
—

 
138,000

 
$
431

Stock options with time-based service vesting conditions
 
1,368,000

 
2,930

 
3,434,000

 
5,704

Stock options with market-based vesting conditions
 
—

 
—

 
2,250,000

 
5,530

Stock options with performance-based vesting conditions
 
—

 
—

 
200,000

 
487

Total incentive awards granted
 
1,368,000

 
$
2,930

 
6,022,000

 
$
12,152
Stock Options Activity
The following table summarizes stock option activity for the Plans for the year ended December 31, 2017:
 
 
 
 
Weighted-Average
 
 
 
 
Options
 
Exercise
Price
 
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2016
 
5,596,000

 
$
4.93

 
 
 
 
Granted
 
1,368,000

 
$
5.52

 
 
 
 
Exercised
 
(208,000
)
 
$
3.57

 
 
 
 
Expired/forfeited
 
(926,000
)
 
$
4.90

 
 
 
 
Outstanding at December 31, 2017
 
5,830,000

 
$
5.13

 
5.8 years
 
$
856,000

Vested
 
1,959,000

 
$
4.84

 
5.8 years
 
$
434,000

Exercisable at December 31, 2017
 
1,959,000

 
$
4.84

 
5.8 years
 
$
434,000
Nonvested Restricted Stock Activity
The following table summarizes nonvested restricted share activity for the year ended December 31, 2017:
 
 
Nonvested
Restricted Shares
 
Weighted
Average Grant Date Fair Value
Nonvested restricted stock at December 31, 2016
 
333,000

 
$
8.9

Granted
 
—

 
$
—

Vested
 
(120,000
)
 
$
12.95

Canceled
 
(90,000
)
 
$
9.10

Nonvested restricted stock at December 31, 2017
 
123,000

 
$
4.77
Restricted Stock Units Activity
The following table summarizes restricted stock unit activity for the year ended December 31, 2017:
 
 
Restricted
Stock Units
 
Weighted
Average Grant Date Fair Value
Nonvested restricted stock units outstanding at December 31, 2016
 
14,000

 
$
16.27

Vested
 
(12,000
)
 
$
16.18

Nonvested restricted stock units outstanding at December 31, 2017
 
2,000

 
$
16.72

Vested restricted stock units outstanding at December 31, 2017
 
60,000

 
$
15.38