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SCHEDULE V - VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for losses on commercial mortgage loans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in valuation and qualifying accounts    
Balance at beginning of period $ 724 $ 0
Additions, Charged to costs and expenses (7,439) (4,682)
Additions, Charged to other accounts 0 0
Deductions 6,715 5,406
Balance at end of period $ 0 $ 724