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Investments, Securities with Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months $ 91,645 $ 104,770
12 months or longer 20,587 18,374
Total Fair Value 112,232 123,144
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]    
Less than 12 months 2,985 4,956
12 months or longer 2,556 5,103
Total Unrealized Losses 5,541 10,059
Fixed Maturities - U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]    
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months 23,494 9,209
12 months or longer 0 2,243
Total Fair Value 23,494 11,452
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]    
Less than 12 months 553 120
12 months or longer 0 55
Total Unrealized Losses 553 175
Fixed Maturities - Obligations of States and Political Subdivisions [Member]    
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months 8,747 16,079
12 months or longer 0 0
Total Fair Value 8,747 16,079
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]    
Less than 12 months 308 552
12 months or longer 0 0
Total Unrealized Losses 308 552
Fixed Maturities - Corporate Securities [Member]    
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months 59,404 79,482
12 months or longer 20,587 16,131
Total Fair Value 79,991 95,613
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract]    
Less than 12 months 2,124 4,284
12 months or longer 2,556 5,048
Total Unrealized Losses $ 4,680 $ 9,332