Investments (Impaired Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	$ 32,918				$ 38,470
Recorded Investment	32,344				37,841
Related Allowance	1,677				3,211
Carrying Value	30,667				34,630
Average Investment	35,093	[1]	40,562	[1]
Interest Income	511		375
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	12,308				16,772
Recorded Investment	12,337				16,741
Related Allowance	1,677				3,211
Carrying Value	10,660				13,530
Average Investment	20,554	[1]	27,184	[1]
Interest Income	193		240
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	20,610				21,698
Recorded Investment	20,007				21,100
Related Allowance	0				0
Carrying Value	20,007				21,100
Average Investment	14,539	[1]	13,378	[1]
Interest Income	$ 318		$ 135

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