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SCHEDULE V-VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for uncollectible reinsurance - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for uncollectible reinsurance      
Balance at beginning of period $ 25,911 $ 25,911 $ 26,404
Amounts charged to expense  
Amounts recovered (written off) (493)
Balance at end of period $ 25,911 $ 25,911 $ 25,911