SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Reclassification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Amount Reclassified from Accumulated Other Comprehensive Earnings
Net realized investment gains	$ 5,708	$ 10,999	$ 22,640	$ 18,425
Earnings before income taxes	48,594	55,309	143,008	134,854
Income tax expense	(15,340)	(17,662)	(45,060)	(42,458)
Net earnings	33,254	37,647	97,948	92,396
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	5,709	10,998	22,637	19,261
Earnings before income taxes	5,709	10,998	22,637	19,261
Income tax expense	(1,998)	(3,849)	(7,923)	(6,741)
Net earnings	$ 3,711	$ 7,149	$ 14,714	$ 12,520