Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Supplemental Disclosure of Cash Flow Information:
Interest paid	$ 18,674	$ 19,531
Income taxes paid	604	621
Investing Activities:
Accrued capital expenditures	1,991	(3,795)
The following represents the significant increase (decrease) in certain assets and liabilities in connection with our acquisition of operating properties:
Real estate investments	0	43,497
Real estate notes receivable	0	(37,403)
Intangible assets	0	10,503
Accounts payable and accrued liabilities	0	16,597
Financing Activities:
Issuance of common stock under the DRIP	0	31,915
Dividends declared on common stock and OP units, but not paid, including common stock issued under the DRIP	32,493	11,284
Offering costs transferred to equity	$ 1,187	$ 0