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Investments (Impaired Mortgage Loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance $ 6,427 $ 2,758  
Impaired Financing Receivable, Recorded Investment 5,858 2,216  
Impaired Financing Receivable, Related Allowance 0 0  
Impaired Financing Receivable Net Of Related Allowance 5,858 2,216  
Impaired Financing Receivable, Average Recorded Investment [1] 3,621 2,249 $ 17,625
Impaired Financing Receivable, Interest Income, Accrual Method 186 142 1,100
Impaired mortgage loans with no valuation allowance recorded      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 6,427 2,758  
Impaired Financing Receivable, Recorded Investment 5,858 2,216  
Impaired Financing Receivable, Related Allowance 0 0  
Impaired Financing Receivable Net Of Related Allowance 5,858 2,216  
Impaired Financing Receivable, Average Recorded Investment 3,621 2,249 [1] 6,033 [1]
Impaired Financing Receivable, Interest Income, Accrual Method 186 142 330
Impaired mortgage loans with valuation allowance recorded      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 0 0  
Impaired Financing Receivable, Recorded Investment 0 0  
Impaired Financing Receivable, Related Allowance 0 0  
Impaired Financing Receivable Net Of Related Allowance 0 0  
Impaired Financing Receivable, Average Recorded Investment 0 0 [1] 11,592 [1]
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0 $ 770
[1] Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.