Mortgage Loans on Real Estate (Allowance for Loan Losses Rollforward) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Specific Allowance [Member]	Jun. 30, 2013 Specific Allowance [Member]	Jun. 30, 2014 Specific Allowance [Member]	Jun. 30, 2013 Specific Allowance [Member]	Jun. 30, 2014 General Allowance [Member]	Jun. 30, 2013 General Allowance [Member]	Jun. 30, 2014 General Allowance [Member]	Jun. 30, 2013 General Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning allowance balance	$ (26,582)	$ (26,047)	$ (16,462)	$ (22,631)	$ (16,847)	$ (23,134)	$ (8,800)	$ (10,400)	$ (9,200)	$ (11,100)
Charge-offs			1,808	2,612	2,757	4,181	0	0	0	0
Recoveries			255	0	255	0	0	0	0	0
Provision for credit losses			(2,883)	(1,157)	(3,447)	(2,223)	(500)	(100)	(100)	600
Ending allowance balance	$ (26,582)	$ (26,047)	$ (17,282)	$ (21,176)	$ (17,282)	$ (21,176)	$ (9,300)	$ (10,500)	$ (9,300)	$ (10,500)