Recently Issued Accounting Pronouncements - Adoption of ASU 2016-13 (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity, bonds held-to-maturity, at amortized cost	$ (21,385)	$ 0	$ (21,664)
Mortgage loans on real estate	59,445		$ 19,160
Reinsurance recoverables	$ 17,713	(8,220)
Off-Balance Sheet Credit Exposures		0
Total		(27,380)
Commercial Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Mortgage loans on real estate		(19,160)
Adjustment to Adopt ASC 326
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity, bonds held-to-maturity, at amortized cost		(21,664)
Reinsurance recoverables		(7,920)
Off-Balance Sheet Credit Exposures		(3,126)
Total		(43,934)
Adjustment to Adopt ASC 326 | Commercial Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Mortgage loans on real estate		(11,224)
Balance as of January 1, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity, bonds held-to-maturity, at amortized cost		(21,664)
Reinsurance recoverables		(16,140)
Off-Balance Sheet Credit Exposures		(3,126)
Total		(71,314)
Balance as of January 1, 2020 | Commercial Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Mortgage loans on real estate		$ (30,384)