Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Net income (loss)	$ (22,889)	$ 84,290	$ 117,253
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	191,006	181,588	168,508
Impairment charges	6,204	0	0
Amortization of non-cash items within interest expense	9,482	7,328	7,215
Amortization of acquired above and below-market leases, net	(3,627)	(7,311)	(6,120)
Amortization of acquired below-market ground leases	7,831	7,831	7,831
Straight-lining of rental revenue	(5,238)	(20,057)	(22,107)
Equity based compensation	25,495	20,857	18,785
Settlement of derivative contract	(20,281)	(11,802)	0
Loss on early extinguishment of debt	86	0	0
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	(151)	(27,243)	10,717
Tenant and other receivables	3,881	4,015	(1,275)
Deferred leasing costs	(14,464)	(30,895)	(26,899)
Prepaid expenses and other assets	(11,730)	(3,643)	(781)
Accounts payable and accrued expenses	(3,305)	427	1,993
Deferred revenue and other liabilities	19,993	27,206	3,902
Net cash provided by operating activities	182,293	232,591	279,022
Cash Flows From Investing Activities
Short-term investments	0	400,000	(400,000)
Additions to building and improvements and development costs	(143,118)	(250,256)	(243,023)
Net cash (used in) provided by investing activities	(143,118)	149,744	(643,023)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	180,000	0	160,000
Repayment of mortgage notes payable	(3,938)	(3,790)	(266,613)
Proceeds from unsecured senior notes	175,000	0	335,000
Repayment of unsecured senior notes	0	(250,000)	0
Proceeds from unsecured term loan	175,000	0	0
Repayment of unsecured term loan	(50,000)	0	0
Proceeds from unsecured revolving credit facility	550,000	0	0
Repayment of unsecured revolving credit facility	(550,000)	0	0
Deferred financing costs	(10,135)	0	(1,980)
Net proceeds from the sale of common stock	0	0	4,749
Repurchases of common shares	(143,713)	0	0
Private perpetual preferred unit distributions	(4,197)	(1,743)	(936)
Dividends paid to common stockholders	(37,181)	(75,192)	(70,854)
Distributions paid to noncontrolling interests in the operating partnership	(23,669)	(50,826)	(54,749)
Net cash provided by (used in) financing activities	257,167	(381,551)	104,617
Net increase (decrease) in cash and cash equivalents and restricted cash	296,342	784	(259,384)
Cash and cash equivalents and restricted cash—beginning of period	271,597	270,813	530,197
Cash and cash equivalents and restricted cash—end of period	567,939	271,597	270,813
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	233,946	204,981	464,344
Restricted cash at beginning of period	37,651	65,832	65,853
Cash and cash equivalents and restricted cash—end of period	526,714	233,946	204,981
Restricted cash at end of period	41,225	37,651	65,832
Cash and cash equivalents and restricted cash	271,597	271,597	270,813
Supplemental disclosures of cash flow information:
Cash paid for interest	75,416	76,333	74,160
Interest capitalized	0	1,433	1,596
Cash paid for income taxes	1,282	1,766	4,847
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	58,057	90,910	85,242
Write-off of fully depreciated assets	79,527	30,977	39,665
Conversion of operating partnership units and Class B shares to Class A shares	29,863	27,495	70,779
Issuance of Series 2019 private perpetual preferred in exchange for common units	789	21,147	$ 0
Right of use assets	0	29,452
Ground lease liabilities	$ 0	$ 29,452