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Fair Value (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair value by pricing source    
Available-for-sale securities $ 744,682 $ 713,291
Fair value measurements on a recurring basis    
Fair value by pricing source    
Available-for-sale securities 744,682 713,291
Total 749,058 717,703
Fair value measurements on a recurring basis | Fixed maturities    
Fair value by pricing source    
Available-for-sale securities 744,682 707,341
Fair value measurements on a recurring basis | Fixed maturities | Priced via pricing services    
Fair value by pricing source    
Available-for-sale securities 744,682  
Fair value measurements on a recurring basis | Common stock    
Fair value by pricing source    
Available-for-sale securities   5,950
Fair value measurements on a recurring basis | Real estate    
Fair value by pricing source    
Other investments 4,376 4,412
Fair value measurements on a recurring basis | Real estate | Priced via unobservable inputs    
Fair value by pricing source    
Other investments 4,376  
Fair value measurements on a recurring basis | Level 1    
Fair value by pricing source    
Available-for-sale securities 0 5,950
Total 0 5,950
Fair value measurements on a recurring basis | Level 1 | Fixed maturities    
Fair value by pricing source    
Available-for-sale securities 0 0
Fair value measurements on a recurring basis | Level 1 | Fixed maturities | Priced via pricing services    
Fair value by pricing source    
Available-for-sale securities 0  
Fair value measurements on a recurring basis | Level 1 | Common stock    
Fair value by pricing source    
Available-for-sale securities   5,950
Fair value measurements on a recurring basis | Level 2    
Fair value by pricing source    
Available-for-sale securities 735,387 697,989
Total 735,387 697,989
Fair value measurements on a recurring basis | Level 2 | Fixed maturities    
Fair value by pricing source    
Available-for-sale securities 735,387 697,989
Fair value measurements on a recurring basis | Level 2 | Fixed maturities | Priced via pricing services    
Fair value by pricing source    
Available-for-sale securities 735,387  
Fair value measurements on a recurring basis | Level 2 | Common stock    
Fair value by pricing source    
Available-for-sale securities   0
Fair value measurements on a recurring basis | Level 3    
Fair value by pricing source    
Available-for-sale securities 9,295 9,352
Total 9,295 9,352
Fair value measurements on a recurring basis | Level 3 | Non-binding broker quotes classified within Level 3    
Fair value by pricing source    
Available-for-sale securities 9,300  
Fair value measurements on a recurring basis | Level 3 | Fixed maturities    
Fair value by pricing source    
Available-for-sale securities 9,295 9,352
Fair value measurements on a recurring basis | Level 3 | Fixed maturities | Priced via pricing services    
Fair value by pricing source    
Available-for-sale securities 9,295  
Fair value measurements on a recurring basis | Level 3 | Common stock    
Fair value by pricing source    
Available-for-sale securities   $ 0
Fair value measurements on a nonrecurring basis    
Fair value by pricing source    
Total $ 0