CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net earnings	$ 6,646,000	$ 31,938,000
Adjustments to reconcile net earnings to net cash flow provided by operating activities:
Depreciation and amortization expense	10,966,000	7,354,000
Impairment charges	10,552,000	3,094,000
Gains from dispositions of real estate	(3,819,000)	(629,000)
Deferred rental revenue, net of allowance	(2,858,000)	(213,000)
Allowance for deferred rent and accounts receivable	16,524,000	11,292,000
Amortization of above-market and below-market leases	(245,000)	(533,000)
Accretion expense	2,250,000	469,000
Stock-based employee compensation expense	547,000	480,000
Changes in assets and liabilities:
Net investment in direct financing leases	523,000	334,000
Accounts receivable, net	(14,968,000)	(1,177,000)
Other assets	(5,445,000)	547,000
Environmental remediation costs	(5,169,000)	(802,000)
Accounts payable and accrued liabilities	(3,254,000)	540,000
Net cash flow provided by operating activities	12,250,000	52,694,000
Cash flows from investing activities:
Property acquisitions and capital expenditures	(2,494,000)	(167,475,000)
Proceeds from dispositions of real estate	5,882,000	1,464,000
(Increase) decrease in cash held for property acquisitions	(3,287,000)	149,000
Collection of notes and mortgages receivable	1,169,000	483,000
Issuance of notes receivable		(30,400,000)
Net cash flow provided by (used in) investing activities	1,270,000	(195,779,000)
Cash flows from financing activities:
Borrowings under credit agreement	4,000,000	247,253,000
Repayments under credit agreement		(140,853,000)
Repayments under term loan agreement	(585,000)	(585,000)
Payments of cash dividends	(4,202,000)	(46,654,000)
Payments of loan origination costs	(4,044,000)	(175,000)
Net proceeds from issuance of common stock		91,986,000
Net cash flow provided by (used in) financing activities	(4,831,000)	150,972,000
Net increase in cash and cash equivalents	8,689,000	7,887,000
Cash and cash equivalents at beginning of period	7,698,000	6,122,000
Cash and cash equivalents at end of period	16,387,000	14,009,000
Supplemental disclosures of cash flow information Cash paid (refunded) during the period for:
Interest paid	4,550,000	4,536,000
Income taxes paid, net	417,000	115,000
Environmental remediation costs	2,279,000	2,092,000
Non-cash transactions:
Issuance of mortgages related to property dispositions	$ 2,561,000	$ 808,000