Real Estate Loans Receivable (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Summary of allowance for losses on loans receivable
Balance at beginning of year	$ 0		$ 0		$ 0
Provision for loan losses	0		2,110,000		27,008,000
Charge-offs	0		2,110,000		27,008,000
Balance at end of year	0		0		0
Summary of loan impairments
Balance of impaired loans at end of year	21,000,000		500,000		4,230,000
Allowance for loan losses	0		0		0
Balance of impaired loans not reserved	21,000,000		500,000		4,230,000
Average impaired loans for the year	10,750,000		2,365,000		5,237,000
Interest recognized on impaired loans	$ 757,000	[1]	$ 206,000	[1]	$ 44,000	[1]

[1] (1) Represents interest recognized prior to placement on non-accrual status.