INVESTMENTS Debt and Short-term Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Other invested assets
Other investments	$ 54,262		$ 51,542
Investments pledged as collateral	$ 16,000
Investment in Federal Home Loan Bank Stock	us-gaap:AssetPledgedAsCollateralMember
Federal Home Loan Bank Borrowings, Fair Value Disclosure	$ 0
Cash and Short-term Investments
Cash	25,181		30,140
Short-term investments, at cost which approximates fair value	44,087		11,550
Investment In Low Income Housing Tax Credit Partnership Net Of Amortization Member
Other invested assets
Other investments	19,700		$ 20,300
Total tax benefit on investments in housing tax credit partnership	600	$ 600
Qualified Affordable Housing Project Investments, Commitment	7,000
Investment in Private Funds
Other invested assets
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 15,100