INVESTMENTS Debt Securities and Common Stock (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) security position	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Securities in unrealized loss positions
Unrealized Loss	$ 13,929,000		$ 18,596,000
Other-than-temporary impairment (OTTI) losses	$ 2,090,000
Debt securities
Securities in unrealized loss positions
Number of unrealized loss positions | position	319
Number of securities in unrealized loss positions for 12 months or longer | security	33
Unrealized losses as percentage of fixed income portfolio cost basis	0.80%
Number of securities with OTTI losses recognized in earnings | security	2
Other than Temporary Impairment Losses recognized in earnings	$ 2,100,000	$ 0
Other than Temporary Impairment Losses recognized in other comprehensive earnings	$ 0	0
Common stock security
Securities in unrealized loss positions
Number of unrealized loss positions | position	5
Number of securities in unrealized loss positions for 12 months or longer | security	1
Unrealized Loss	$ 1,700,000
Other-than-temporary impairment (OTTI) losses	$ 0	$ 0