INVESTMENTS Debt and Short-term Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Other invested assets
Other investments	$ 55,196		$ 55,196		$ 51,542
Investments pledged as collateral	$ 16,300		$ 16,300
Investment in Federal Home Loan Bank Stock	us-gaap:AssetPledgedAsCollateralMember		us-gaap:AssetPledgedAsCollateralMember
Federal Home Loan Bank Borrowings, Fair Value Disclosure	$ 0		$ 0
Cash and Short-term Investments
Cash	24,834		24,834		30,140
Short-term investments, at cost which approximates fair value	47,353		47,353		11,550
Investment In Low Income Housing Tax Credit Partnership Net Of Amortization Member
Other invested assets
Other investments	19,400		19,400		$ 20,300
Total tax benefit on investments in housing tax credit partnership	600	$ 600	1,200	$ 1,100
Qualified Affordable Housing Project Investments, Commitment	7,100		7,100
Investment in Private Funds
Other invested assets
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 12,400		$ 12,400