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Commitments and Contingencies (Narrative and Schedule of Future Minimum Rental Payments for Operating Leases) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]          
Rent expense     $ 2,800 $ 2,700 $ 2,700
Aggregate future minimum lease payments due $ 16,900   16,900    
2017 1,890   1,890    
2018 1,915   1,915    
2019 1,898   1,898    
2020 1,950   1,950    
2021 1,754   1,754    
2022 and thereafter 7,464   7,464    
Change in estimated litigation liability (4,100) $ (6,400)      
Legal fees paid 4,100 1,800      
Loss contingency reclassified to policy benefit reserves   (1,800)      
Loss contingency accrual, decrease due to additional information on claims and based on the terms of the settlement   $ (2,800)      
Estimated litigation liability 600   600    
Unfunded commitments to limited partnerships 48,400   48,400    
Unfunded commitments to secured bank loans $ 34,300   $ 34,300