Loans Held for Investment (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	11
Weighted-average interest rate	6.90%
Weighted-average years to maturity	9 years 3 months 18 days
Mortgage notes receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage notes with capitalized principal and interest	1
Loans held for investment	10
Weighted-average interest rate	6.30%
Weighted-average years to maturity	13 years 9 months 18 days