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Investments - Narrative (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
Sep. 30, 2016
security
Schedule of Available-for-sale Securities [Line Items]        
Number of fixed maturity securities | security       2
Impairment loss   $ 0 $ 0  
Number of fixed maturity and equity securities | security 269 528    
Percentage of gross unrealized loss 100.00% 100.00%    
Other Nonoperating Income (Expense)        
Schedule of Available-for-sale Securities [Line Items]        
Recorded impairment $ (2,500,000)      
Impairment loss 163,000 $ 0    
Gain (Loss) on Investments        
Schedule of Available-for-sale Securities [Line Items]        
Recorded impairment $ (200,000)      
Fixed maturity securities        
Schedule of Available-for-sale Securities [Line Items]        
Percentage of gross unrealized loss 100.00% 100.00%    
Fixed maturity securities | Investment grade        
Schedule of Available-for-sale Securities [Line Items]        
Percentage of gross unrealized loss 54.50% 33.20%    
Percentage of fair value 83.00% 88.30%    
Not designated as hedging instrument | Mortgage-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Investments at fair value $ 15,200,000 $ 21,000,000    
Gain resulting for changes in fair value of securities $ (1,200,000) $ 300,000