INVESTMENTS Debt Securities and Common Stock (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) security position	Jun. 30, 2018 USD ($) security position	Jun. 30, 2017 USD ($) security
Securities in unrealized loss positions
Other-than-temporary impairment (OTTI) losses		$ 56	$ 2,090
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 9,100	$ 4,800
Debt securities
Securities in unrealized loss positions
Number of unrealized loss positions | position	706	706
Number of securities in unrealized loss positions for 12 months or longer | security	121	121
Unrealized losses as percentage of fixed income portfolio cost basis	1.70%	1.70%
Number of securities with OTTI losses recognized in earnings | security	1	1	2
Other than Temporary Impairment Losses recognized in earnings		$ 100	$ 2,100
Other than Temporary Impairment Losses recognized in other comprehensive earnings		$ 0	$ 0