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Schedule V (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation provision      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 376 $ 372 $ 3,553
Additions Charged to Costs and Expenses 4,086 5,784 2,679
Additions Charge to Other Accounts – Describe 0 0 0
Deductions – Describe (4,158) (5,780) (5,860)
Balance at End of Period 304 376 372
Reserves for claims      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 34,801 35,305 37,788
Additions Charged to Costs and Expenses (332) 3,311 243
Additions Charge to Other Accounts – Describe 0 0 0
Deductions – Describe (2,740) (3,815) (2,726)
Balance at End of Period $ 31,729 $ 34,801 $ 35,305