Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Land	$ 1,127,485	$ 1,098,526
Buildings and improvements	7,057,101	6,935,971
Real estate assets, at cost, total	8,184,586	8,034,497
Accumulated depreciation	(2,479,875)	(2,403,149)
Net operating real estate assets	5,704,711	5,631,348
Properties under development, including land	307,981	293,978
Investments in joint ventures	21,955	22,283
Total real estate assets	6,034,647	5,947,609
Accounts receivable – affiliates	21,337	22,920
Other assets, net	217,663	205,454
Cash and cash equivalents	6,092	34,378
Restricted cash	5,655	9,225
Total assets	6,285,394	6,219,586
Liabilities
Unsecured notes payable	2,079,136	1,836,427
Secured notes payable	45,683	485,176
Accounts payable and accrued expenses	126,964	146,866
Accrued real estate taxes	30,891	54,358
Distributions payable	80,771	74,982
Other liabilities	195,629	183,999
Total liabilities	2,559,074	2,781,808
Commitments and contingencies (Note 13)
Non-qualified deferred compensation share awards	0	52,674
Equity
Common shares of beneficial interest; $0.01 par value per share; 175,000 shares authorized; 108,878 and 105,503 issued; 106,347 and 103,080 outstanding at March 31, 2019 and December 31, 2018, respectively	1,064	1,031
Additional paid-in capital	4,527,659	4,154,763
Distributions in excess of net income attributable to common shareholders	(526,856)	(495,496)
Treasury shares, at cost (9,671 and 9,841 common shares at March 31, 2019 and December 31, 2018, respectively)	(349,655)	(355,804)
Accumulated other comprehensive income	616	6,929
Total common equity	3,652,828	3,311,423
Non-controlling interests	73,492	73,681
Total equity	3,726,320	3,385,104
Total liabilities and equity	$ 6,285,394	$ 6,219,586