Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net earnings	$ 64,966	$ 6,646
Adjustments to reconcile net earnings to net cash flow provided by operating activities:
Depreciation and amortization expense	7,498	10,966
Impairment charges	7,717	10,552
Gains on dispositions of real estate	(39,581)	(3,819)
Deferred rent receivable, net of allowance	(5,117)	(2,858)
Allowance (credit) for accounts receivable	(21,006)	16,524
Other	4,391	5,704
Changes in assets and liabilities:
Accounts receivable, net	22,184	(14,968)
Prepaid expenses and other assets	102	(7,750)
Environmental remediation obligations	(10,358)	(5,169)
Accounts payable and accrued liabilities	8,005	(3,578)
Net cash flow provided by operating activities	38,801	12,250
Cash flows from investing activities:
Property acquisitions and capital expenditures	(73,353)	(2,494)
Proceeds from dispositions of real estate	51,276	5,882
Increase in cash held for property acquisitions	(6,880)	(3,287)
Issuance of notes and mortgages receivables	(4,138)
Collection of notes and mortgages receivable	10,803	1,169
Other	735
Net cash flow provided by (used in) investing activities	(21,557)	1,270
Cash flows from financing activities:
Borrowings under credit agreements	129,400	4,000
Repayments under credit agreements	(216,190)
Borrowings under term loan agreement	100,000
Repayments under term loan agreement	(22,030)	(585)
Payments of cash dividends	(17,680)	(4,202)
Payments of loan origination costs	(2,842)	(4,044)
Other	(108)
Net cash flow used in financing activities	(29,450)	(4,831)
Net increase (decrease) in cash and cash equivalents	(12,206)	8,689
Cash and cash equivalents at beginning of period	16,876	7,698
Cash and cash equivalents at end of period	4,670	16,387
Supplemental disclosures of cash flow information Cash paid (refunded) during the period for:
Interest paid	7,192	4,550
Income taxes paid, net	450	417
Environmental remediation obligations	9,329	2,279
Non-cash transactions:
Issuance of mortgages related to property dispositions	$ 4,923	$ 2,561