Investments (Impaired Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	$ 29,119				$ 29,119				$ 38,470
Recorded Investment	28,544				28,544				37,841
Related Allowance	3,714				3,714				3,211
Carrying Value	24,830				24,830				34,630
Average Investment	30,444	[1]	39,392	[1]	32,910	[1]	39,580	[1]
Interest Income	330		343		841		718
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	19,346				19,346				16,772
Recorded Investment	19,374				19,374				16,741
Related Allowance	3,714				3,714				3,211
Carrying Value	15,660				15,660				13,530
Average Investment	15,855	[1]	24,211	[1]	16,151	[1]	25,294	[1]
Interest Income	259		294		452		534
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	9,773				9,773				21,698
Recorded Investment	9,170				9,170				21,100
Related Allowance	0				0				0
Carrying Value	9,170				9,170				21,100
Average Investment	14,589	[1]	15,181	[1]	16,759	[1]	14,286	[1]
Interest Income	$ 71		$ 49		$ 389		$ 184

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