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Employment Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Postemployment Benefits [Abstract]  
Schedule of Expected Benefit Payments [Table Text Block]
The following table sets forth projected benefit payments from Ambac’s postretirement plan over the next ten years for current retirees:
2017
 
2018
 
2019
 
2020
 
2021
 
2022-2026
 
Total
$
270

 
$
295

 
$
318

 
$
332

 
$
353

 
$
2,269

 
$
3,837
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]
The amount of stock-based compensation expense and corresponding after-tax expense are as follows:
Year Ended December 31,
2016
 
2015
 
2014
Stock options
$
—

 
$
956

 
$
444

Restricted stock units
3,463

 
1,257

 
2,816

Performance awards (1) (2)
1,790

 
892

 
190

Total stock-based compensation
$
5,253

 
$
3,105

 
$
3,450

Total stock-based compensation (after-tax)
$
5,194

 
$
3,105

 
$
3,450

(1)
Represents expense related to performance stock units portion of performance awards. Performance awards are split evenly between performance stock units and cash. Cash based compensation expense related to performance awards granted to US employees was $1,790, $892 and $190 for the years ended December 31, 2016, 2015 and 2014, respectively.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following assumptions were used in estimating the fair value of options awarded in 2015:
Year Ended December 31,
2015

Risk-free interest rate
1.283
%
Expected volatility
42.8
%
Dividend yield
0.0
%
Expected life
4.13 years

Weighted-average grant-date fair value per share
$
8.69
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of option activity for 2016 is as follows:
 
Shares
 
Weighted Average
Exercise Price
 
Aggregate
Intrinsic Value
 
Weighted Average
Remaining
Contractual
Life ( in years)
Year Ended December 31, 2016
 
 
 
 
 
 
 
Outstanding at beginning of period
176,668

 
$
23.07

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
 
Forfeited or expired
(33,334
)
 
20.63

 
 
 
 
Outstanding at end of period
143,334

 
$
23.64

 
$
62

 
1.99
Exercisable
143,334

 
$
23.64

 
$
62

 
1.99
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
A summary of RSU activity for 2016 is as follows:
 
Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at beginning of period
208,502

 
$
23.32

Granted
422,188

 
14.34

Delivered or returned to plan (1)
(159,488
)
 
23.30

Forfeited
(206,972
)
 
13.77

Outstanding at end of period
264,230

 
$
16.47

(1)
When restricted stock unit awards issued by Ambac become taxable compensation to employees, shares may be withheld to cover the employee’s withholding taxes. For the year ended December 31, 2016, Ambac purchased 23,148 of shares from employees that settled restricted stock units to meet the required tax withholdings.
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
A summary of PSU activity for 2016 is as follows:
 
Shares(1)
 
Weighted Average
Grant Date
Fair Value
Outstanding at beginning of period
130,545

 
$
25.91

Granted
201,480

 
16.27

Delivered
—

 
—

Forfeited
(104,952
)
 
17.40

Outstanding at end of period
227,073

 
$
21.29

(1)
Represents performance share units at 100% of units granted for LTIP Awards.