INVESTMENTS - Portfolio Analysis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) position security	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Securities in unrealized loss positions
Total unrealized loss	$ 18,596	$ 19,252
Other-than-temporary impairment (OTTI) losses	95	0	$ 0
Unrealized losses for 12 consecutive months or longer	3,999	$ 5,407
Fixed maturities and short-term investments on deposit with either regulatory authorities or banks	$ 31,800
Debt securities
Securities in unrealized loss positions
Number of unrealized loss positions | position	377
Number of securities in unrealized loss positions for 12 months or longer | security	44
Maximum period for securities with unrealized losses greater than 20 percent	12 months
Unrealized losses for 12 consecutive months or longer	$ 3,300
Common stock security
Securities in unrealized loss positions
Number of unrealized loss positions | security	4
Number of securities in unrealized loss positions of greater than 20 percent | security	0
Maximum period for securities with unrealized losses greater than 20 percent	6 months
Common stock security | Maximum
Securities in unrealized loss positions
Maximum percentage of unrealized loss to portfolio for more than six consecutive months	20.00%