Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Rental properties, net of accumulated depreciation of $848,280 and $741,334 at September 30, 2018 and December 31, 2017, respectively	$ 4,891,955	$ 4,604,231
Land held for development	31,076	33,692
Property under development	289,228	257,629
Mortgage notes and related accrued interest receivable	572,700	970,749
Investment in direct financing leases, net	20,495	57,903
Investment in joint ventures	5,018	5,602
Cash and cash equivalents	74,153	41,917
Restricted cash	22,031	17,069
Accounts receivable, net	104,757	93,693
Other assets	102,657	109,008
Total assets	6,114,070	6,191,493
Liabilities:
Accounts payable and accrued liabilities	138,829	136,929
Common dividends payable	26,761	25,203
Preferred dividends payable	6,036	4,982
Unearned rents and interest	90,287	68,227
Debt	2,954,962	3,028,827
Total liabilities	3,216,875	3,264,168
Equity:
Common Shares, $.01 par value; 100,000,000 shares authorized; and 77,202,295 and 76,858,632 shares issued at September 30, 2018 and December 31, 2017, respectively	772	769
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Additional paid-in-capital	3,496,283	3,478,986
Treasury shares at cost: 2,865,309 and 2,733,552 common shares at September 30, 2018 and December 31, 2017, respectively	(129,801)	(121,591)
Accumulated other comprehensive income	19,246	12,483
Distributions in excess of net income	(489,453)	(443,470)
Total equity	2,897,195	2,927,325
Total liabilities and equity	6,114,070	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