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Investments - Available for Sale Investments (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Available for sale investments      
Number of unrealized loss positions | security 42 173 125
Available for sale investments      
Amortized Cost $ 202,437 $ 122,949 $ 102,301
Gross Unrealized Gains 5,676 536  
Gross Unrealized Losses (52) (1,265)  
Fair Value 208,061 122,220 101,913
Amortized Cost 21,563 27,188 19,569
Equity securities at fair value 22,368 25,171 23,586
Amortized Cost     121,870
Gross Unrealized Gains     4,330
Gross Unrealized Losses     (701)
Marketable Securities     125,499
Fixed maturity securities      
Available for sale investments      
Amortized Cost     102,301
Gross Unrealized Gains     204
Gross Unrealized Losses     (592)
Fair Value     101,913
U.S. Governments      
Available for sale investments      
Amortized Cost 13,331 15,299 13,393
Gross Unrealized Gains 392 96  
Gross Unrealized Losses (12) (126) (108)
Fair Value 13,711 15,269 13,285
States, territories, and possession      
Available for sale investments      
Amortized Cost   1,227 3,188
Gross Unrealized Gains     10
Gross Unrealized Losses   (6) (1)
Fair Value   1,221 3,197
Political subdivisions      
Available for sale investments      
Amortized Cost 1,930 825 4,118
Gross Unrealized Gains 14    
Gross Unrealized Losses (1) (10) (51)
Fair Value 1,943 815 4,067
Special revenue excluding mortgage/asset-backed securities      
Available for sale investments      
Amortized Cost 15,337 12,429 24,039
Gross Unrealized Gains 470 115 42
Gross Unrealized Losses (4) (91) (167)
Fair Value 15,803 12,453 23,914
Industrial and miscellaneous      
Available for sale investments      
Amortized Cost 117,652 65,885 44,582
Gross Unrealized Gains 3,784 192 150
Gross Unrealized Losses (32) (951) (201)
Fair Value 121,404 65,126 44,531
Mortgage/asset-backed securities      
Available for sale investments      
Amortized Cost 51,885 27,284 12,981
Gross Unrealized Gains 900 133 2
Gross Unrealized Losses (3) (81) (64)
Fair Value $ 52,782 $ 27,336 $ 12,919
Equity securities      
Available for sale investments      
Number of unrealized loss positions | security     16
Available for sale investments      
Amortized Cost     $ 19,569
Gross Unrealized Gains     4,126
Gross Unrealized Losses     (109)
Equity securities at fair value     $ 23,586