SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Reclassification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Amount Reclassified from Accumulated Other Comprehensive Earnings
Net realized investment gains	$ 13,286	$ 6,501
Earnings before income taxes	44,513	41,991
Income tax expense	(13,915)	(13,022)
Net earnings	30,598	28,969
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	13,217	6,497
Earnings before income taxes	13,217	6,497
Income tax expense	(4,626)	(2,274)
Net earnings	$ 8,591	$ 4,223