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OPERATING SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
REVENUES    
Net premiums earned $ 176,918 $ 169,003
Net investment income 13,370 13,495
Net realized gains 11,400 13,286
Consolidated revenue 201,688 195,784
NET EARNINGS (LOSSES)    
Net underwriting income 21,304 17,638
Net investment income 13,370 13,495
Net realized gains 11,400 13,286
General corporate expense and interest on debt (4,232) (4,100)
Equity in earnings of unconsolidated investees 3,751 4,194
Earnings before income taxes 45,593 44,513
Income tax expense 14,200 13,915
Net earnings 31,393 30,598
Casualty segment    
REVENUES    
Net premiums earned 108,593 98,768
NET EARNINGS (LOSSES)    
Net underwriting income 9,106 5,272
Property segment    
REVENUES    
Net premiums earned 38,685 42,118
NET EARNINGS (LOSSES)    
Net underwriting income 6,198 8,176
Surety segment    
REVENUES    
Net premiums earned 29,640 28,117
NET EARNINGS (LOSSES)    
Net underwriting income $ 6,000 $ 4,190