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Investments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Unrealized loss position, accumulated loss $ 1,010,000   $ 1,010,000   $ 15,484,000
Unrealized loss position, 12 months or greater 778,000   778,000   10,385,000
Other-than-temporary impairment 0 $ 0 400,000 $ 0  
U.S. Treasury securities and obligations of U.S. government agencies          
Debt Securities, Available-for-sale [Line Items]          
Cash and investments held with various state insurance departments 5,500,000   5,500,000   5,300,000
Unrealized loss position, accumulated loss 116,000   116,000   1,376,000
Unrealized loss position, 12 months or greater $ 116,000   $ 116,000   $ 1,376,000