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Investments (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
property
Feb. 20, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Loans originated during the year $ 29,900 $ 59,400    
Real estate investments 56,851 51,828    
Realized gains (losses) on investments 8,423 14,763 $ 13,070  
Number of real estate properties | property     2  
Payments to acquire real estate     $ 16,800  
OTTI- recoveries (0) 600 100  
Real Estate        
Debt Securities, Available-for-sale [Line Items]        
Real estate investments 35,700 37,400    
Operating income recognized on real estate investment properties 2,200 2,900 2,600  
Realized gains (losses) on investments 1,800 2,700 2,900  
Other-than Temporary Impairment Write-down on Investments        
Debt Securities, Available-for-sale [Line Items]        
Realized gains (losses) on investments 0      
Debt Securities        
Debt Securities, Available-for-sale [Line Items]        
Realized gains (losses) on investments 8,400 14,800 13,100  
External Credit Rating, Non Investment Grade | Debt Securities        
Debt Securities, Available-for-sale [Line Items]        
Debt securities below investment grade $ 94,200 $ 101,300    
Debt securities below investment grade, percentage of total invested assets 0.90% 0.90%    
Maximum        
Debt Securities, Available-for-sale [Line Items]        
Loan to value ratio, threshold (in percentage) 90.00%      
Non- Income Producing        
Debt Securities, Available-for-sale [Line Items]        
Real estate investment $ 5,200 $ 100 $ 200  
Subsequent Event        
Debt Securities, Available-for-sale [Line Items]        
Real estate held-for-sale       $ 8,600