Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		$ 16,931	$ 17,593
Impaired Financing Receivable, Recorded Investment		16,421	17,027
Impaired Financing Receivable, Related Allowance		588	816
Impaired Financing Receivable Net Of Related Allowance		15,833	16,211
Impaired Financing Receivable, Average Recorded Investment	[1]	17,625	27,054	$ 37,841
Impaired Financing Receivable, Interest Income, Accrual Method		1,100	1,284	1,803
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		4,033	7,314
Impaired Financing Receivable, Recorded Investment		4,033	6,711
Impaired Financing Receivable, Related Allowance		0	0
Impaired Financing Receivable Net Of Related Allowance		4,033	6,711
Impaired Financing Receivable, Average Recorded Investment	[1]	6,033	13,227	15,023
Impaired Financing Receivable, Interest Income, Accrual Method		330	647	852
Impaired mortgage loans with valuation allowance recorded
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		12,898	10,279
Impaired Financing Receivable, Recorded Investment		12,388	10,316
Impaired Financing Receivable, Related Allowance		588	816
Impaired Financing Receivable Net Of Related Allowance		11,800	9,500
Impaired Financing Receivable, Average Recorded Investment	[1]	11,592	13,827	22,818
Impaired Financing Receivable, Interest Income, Accrual Method		$ 770	$ 637	$ 951

[1] Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.