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Investments - Security Holdings in an Unrealized Loss Position - Tabular Disclosure (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value      
Fair Value - Less Than 12 Months $ 908 $ 41,856 $ 66,596
Fair Value - More Than 12 Months 14,947 31,907 13,637
Fair Value - Total 15,855 73,763 80,233
Unrealized Losses      
Unrealized Losses - Less Than 12 Months (2) (640) (468)
Unrealized Losses - More Than 12 Months (50) (625) (233)
Unrealized Losses - Total (52) (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   1,970 11,426
Fair Value - More Than 12 Months 3,302 6,197 1,858
Fair Value - Total 3,302 8,167 13,284
Unrealized Losses      
Unrealized Losses - Less Than 12 Months   (25) (89)
Unrealized Losses - More Than 12 Months (12) (101) (19)
Unrealized Losses - Total (12) (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   264 2,996
Fair Value - More Than 12 Months 550 550 1,071
Fair Value - Total 550 814 4,067
Unrealized Losses      
Unrealized Losses - Less Than 12 Months   (1) (24)
Unrealized Losses - More Than 12 Months (1) (9) (27)
Unrealized Losses - Total (1) (10) (51)
Special revenue excluding mortgage/asset-backed securities      
Fair Value      
Fair Value - Less Than 12 Months   1,706 17,109
Fair Value - More Than 12 Months 1,444 5,916 2,140
Fair Value - Total 1,444 7,622 19,249
Unrealized Losses      
Unrealized Losses - Less Than 12 Months   (14) (129)
Unrealized Losses - More Than 12 Months (4) (77) (38)
Unrealized Losses - Total (4) (91) (167)
Industrial and miscellaneous      
Fair Value      
Fair Value - Less Than 12 Months 398 30,544 23,914
Fair Value - More Than 12 Months 8,197 14,913 4,463
Fair Value - Total 8,595 45,457 28,377
Unrealized Losses      
Unrealized Losses - Less Than 12 Months (2) (556) (137)
Unrealized Losses - More Than 12 Months (30) (395) (64)
Unrealized Losses - Total (32) (951) (201)
Mortgage/asset-backed securities      
Fair Value      
Fair Value - Less Than 12 Months 510 6,653 7,588
Fair Value - More Than 12 Months 1,454 3,830 3,298
Fair Value - Total 1,964 10,483 10,886
Unrealized Losses      
Unrealized Losses - Less Than 12 Months   (39) (31)
Unrealized Losses - More Than 12 Months (3) (42) (33)
Unrealized Losses - Total $ (3) $ (81) (64)
Equity securities      
Fair Value      
Fair Value - Less Than 12 Months     1,995
Fair Value - More Than 12 Months     807
Fair Value - Total     2,802
Unrealized Losses      
Unrealized Losses - Less Than 12 Months     (57)
Unrealized Losses - More Than 12 Months     (52)
Unrealized Losses - Total     $ (109)