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Investments - Security Holdings in an Unrealized Loss Position - Tabular Disclosure (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value      
Fair Value - Less Than 12 Months $ 11,797 $ 41,856 $ 66,596
Fair Value - More Than 12 Months 6,541 31,907 13,637
Fair Value - Total 18,338 73,763 80,233
Unrealized Losses      
Unrealized Losses - Less Than 12 Months (36) (640) (468)
Unrealized Losses - More Than 12 Months (19) (625) (233)
Unrealized Losses - Total (55) (1,265) (701)
Fixed maturity securities      
Fair Value      
Fair Value - Less Than 12 Months     64,601
Fair Value - More Than 12 Months     12,830
Fair Value - Total     77,431
Unrealized Losses      
Unrealized Losses - Less Than 12 Months     (411)
Unrealized Losses - More Than 12 Months     (181)
Unrealized Losses - Total     (592)
U.S. Governments      
Fair Value      
Fair Value - Less Than 12 Months 1,485 1,970 11,426
Fair Value - More Than 12 Months 1,824 6,197 1,858
Fair Value - Total 3,309 8,167 13,284
Unrealized Losses      
Unrealized Losses - Less Than 12 Months   (25) (89)
Unrealized Losses - More Than 12 Months (7) (101) (19)
Unrealized Losses - Total (7) (126) (108)
States, territories, and possession      
Fair Value      
Fair Value - Less Than 12 Months   719 1,568
Fair Value - More Than 12 Months   501  
Fair Value - Total   1,220 1,568
Unrealized Losses      
Unrealized Losses - Less Than 12 Months   (5) (1)
Unrealized Losses - More Than 12 Months   (1)  
Unrealized Losses - Total   (6) (1)
Political subdivisions      
Fair Value      
Fair Value - Less Than 12 Months 546 264 2,996
Fair Value - More Than 12 Months   550 1,071
Fair Value - Total 546 814 4,067
Unrealized Losses      
Unrealized Losses - Less Than 12 Months   (1) (24)
Unrealized Losses - More Than 12 Months   (9) (27)
Unrealized Losses - Total   (10) (51)
Special revenue excluding mortgage/asset-backed securities      
Fair Value      
Fair Value - Less Than 12 Months 569 1,706 17,109
Fair Value - More Than 12 Months 997 5,916 2,140
Fair Value - Total 1,566 7,622 19,249
Unrealized Losses      
Unrealized Losses - Less Than 12 Months (1) (14) (129)
Unrealized Losses - More Than 12 Months (2) (77) (38)
Unrealized Losses - Total (3) (91) (167)
Industrial and miscellaneous      
Fair Value      
Fair Value - Less Than 12 Months 3,936 30,544 23,914
Fair Value - More Than 12 Months 3,457 14,913 4,463
Fair Value - Total 7,393 45,457 28,377
Unrealized Losses      
Unrealized Losses - Less Than 12 Months (22) (556) (137)
Unrealized Losses - More Than 12 Months (9) (395) (64)
Unrealized Losses - Total (31) (951) (201)
Mortgage/asset-backed securities      
Fair Value      
Fair Value - Less Than 12 Months 5,261 6,653 7,588
Fair Value - More Than 12 Months 263 3,830 3,298
Fair Value - Total 5,524 10,483 10,886
Unrealized Losses      
Unrealized Losses - Less Than 12 Months (13) (39) (31)
Unrealized Losses - More Than 12 Months (1) (42) (33)
Unrealized Losses - Total $ (14) $ (81) $ (64)