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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Amount Reclassified from Accumulated Other Comprehensive Earnings        
Net realized investment gains $ 10,431 $ 3,742 $ 16,932 $ 7,426
Earnings before income taxes 52,423 43,576 94,414 79,545
Income tax expense (16,698) (13,674) (29,720) (24,796)
Net earnings 35,725 29,902 64,694 54,749
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 10,431 4,087 16,928 8,263
Earnings before income taxes 10,431 4,087 16,928 8,263
Income tax expense (3,651) (1,430) (5,925) (2,892)
Net earnings $ 6,780 $ 2,657 $ 11,003 $ 5,371