Investments (Impaired Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	$ 20,079				$ 20,079				$ 38,470
Recorded Investment	19,514				19,514				37,841
Related Allowance	786				786				3,211
Carrying Value	18,728				18,728				34,630
Average Investment	24,029	[1]	35,121	[1]	29,561	[1]	37,841	[1]
Interest Income	251		615		1,092		1,334
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	10,329				10,329				16,772
Recorded Investment	10,366				10,366				16,741
Related Allowance	786				786				3,211
Carrying Value	9,580				9,580				13,530
Average Investment	14,870	[1]	21,490	[1]	14,705	[1]	24,337	[1]
Interest Income	26		266		478		801
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	9,750				9,750				21,698
Recorded Investment	9,148				9,148				21,100
Related Allowance	0				0				0
Carrying Value	9,148				9,148				21,100
Average Investment	9,159	[1]	13,631	[1]	14,856	[1]	13,504	[1]
Interest Income	$ 225		$ 349		$ 614		$ 533

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