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Investments (Investment Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments [Line Items]      
Total investment income $ 127,676 $ 131,785 $ 130,820
Less: Investment expense (5,805) (5,486) (5,097)
Net investment income 121,871 126,299 125,723
Fixed Maturity Securities [Member]      
Investments [Line Items]      
Total investment income 104,111 108,122 104,946
Equity Securities [Member]      
Investments [Line Items]      
Total investment income 14,629 14,630 17,313
Short-term Investments [Member]      
Investments [Line Items]      
Total investment income $ 8,936 $ 9,033 $ 8,561