Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Rental properties, net of accumulated depreciation of $883,174 and $741,334 at December 31, 2018 and 2017, respectively	$ 5,024,057	$ 4,604,231
Land held for development	34,177	33,692
Property under development	287,546	257,629
Mortgage Notes and Related Accrued Interest Receivable, Net	517,467	970,749
Investment in direct financing leases, net	20,558	57,903
Investment in joint ventures	34,486	5,602
Cash and cash equivalents	5,872	41,917
Restricted cash	12,635	17,069
Accounts receivable, net	98,369	93,693
Other assets	96,223	109,008
Total assets	6,131,390	6,191,493
Liabilities:
Accounts payable and accrued liabilities	168,463	136,929
Common dividends payable	26,765	25,203
Preferred dividends payable	6,034	4,982
Unearned rents and interest	79,051	68,227
Debt	2,986,054	3,028,827
Total liabilities	3,266,367	3,264,168
Equity:
Common Shares, $.01 par value; 100,000,000 shares authorized; and 77,226,443 and 76,858,632 shares issued at December 31, 2018 and 2017, respectively	772	769
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Additional paid-in-capital	3,504,494	3,478,986
Treasury shares at cost: 2,878,587 and 2,733,552 common shares at December 31, 2018 and 2017, respectively	(130,728)	(121,591)
Accumulated other comprehensive income	12,085	12,483
Distributions in excess of net income	(521,748)	(443,470)
Equity	2,865,023	2,927,325
Total liabilities and equity	6,131,390	6,191,493
Series C Preferred Shares [Member]
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Preferred shares	54	54
Series E Preferred Shares [Member]
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Preferred shares	34	34
Series G Preferred Stock [Member]
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Preferred shares	$ 60	$ 60