Investments - Schedule of OTTI Recognized in Earnings for Available-for-sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Total OTTI losses recognized	$ 545	$ 161	$ 4,246	$ 161
OTTI recognized in earnings	$ 545	161	$ 4,246	161
Does not intend to sell or more-likely-than-not will not be required to sell [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Total OTTI losses recognized		3		3
OTTI recognized in earnings		3		3
Intends to sell or more-likely-than-not will be required to sell before recovery [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings		$ 158		$ 158