CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS
Mortgage loans receivable, allowance for doubtful accounts (in dollars)	$ 1,730	$ 1,671
Straight-line rent receivable, allowance for doubtful accounts (in dollars)	$ 720	$ 1,541
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000	15,000
Preferred stock, shares issued	2,000	2,000
Preferred stock, shares outstanding	2,000	2,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000	60,000
Common stock, shares issued	34,845	34,746
Common stock, shares outstanding	34,845	34,746