SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Reclassification (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amount Reclassified from Accumulated Other Comprehensive Earnings
Net realized investment gains	$ 4,802	$ 10,431	$ 18,088	$ 16,932
Earnings before income taxes	54,650	52,423	99,163	94,414
Income tax expense	(17,465)	(16,698)	(31,380)	(29,720)
Net earnings	37,185	35,725	67,783	64,694
Reclassifications out of accumulated other comprehensive earnings | Unrealized Gains and Losses on Available-for-Sale Securities
Amount Reclassified from Accumulated Other Comprehensive Earnings
Net realized investment gains	4,880	10,431	18,097	16,928
Earnings before income taxes	4,880	10,431	18,097	16,928
Income tax expense	(1,708)	(3,651)	(6,334)	(5,925)
Net earnings	$ 3,172	$ 6,780	$ 11,763	$ 11,003