Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities
Net income	$ 84,290	$ 117,253	$ 118,253
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	181,588	168,508	160,710
Amortization of non-cash items within interest expense	7,328	7,215	1,039
Amortization of acquired above and below-market leases, net	(7,311)	(6,120)	(5,721)
Amortization of acquired below-market ground leases	7,831	7,831	7,831
Straight-lining of rental revenue	(20,057)	(22,107)	(26,544)
Equity based compensation	20,857	18,785	14,100
Settlement of derivative contract	(11,802)	0	(15,695)
Loss on early extinguishment of debt	0	0	2,157
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	(27,243)	10,717	(97)
Tenant and other receivables	4,015	(1,275)	(5,787)
Deferred leasing costs	(30,895)	(26,899)	(31,743)
Prepaid expenses and other assets	(3,643)	(781)	(7,893)
Accounts payable and accrued expenses	427	1,993	(25,103)
Deferred revenue and other liabilities	27,206	3,902	8,695
Net cash provided by operating activities	232,591	279,022	194,202
Cash Flows From Investing Activities
Short-term investments	400,000
Short-term investments		(400,000)	0
Additions to building and improvements	(250,254)	(243,022)	(222,979)
Development costs	(2)	(1)	(34)
Net cash provided by (used in) investing activities	149,744	(643,023)	(223,013)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	0	160,000	315,000
Repayment of mortgage notes payable	(3,790)	(266,613)	(346,615)
Proceeds from senior unsecured notes	0	335,000	115,000
Repayment of senior unsecured notes	(250,000)	0	0
Repayment of unsecured term loan	0	0	(265,000)
Proceeds from unsecured revolving credit and term loan facility	0	0	265,000
Deferred financing costs	0	(1,980)	(13,299)
Net proceeds from the sale of common stock	0	4,749	0
Private perpetual preferred unit distributions	(1,743)	(936)	(936)
Dividends paid to common stockholders	(75,192)	(70,854)	(66,789)
Distributions paid to noncontrolling interests in the operating partnership	(50,826)	(54,749)	(59,238)
Net cash (used in) provided by financing activities	(381,551)	104,617	(56,877)
Net increase (decrease) in cash and cash equivalents and restricted cash	784	(259,384)	(85,688)
Cash and cash equivalents and restricted cash—beginning of period	270,813	530,197	615,885
Cash and cash equivalents and restricted cash—end of period	271,597	270,813	530,197
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	204,981	464,344	554,371
Restricted cash at beginning of period	65,832	65,853	61,514
Cash and cash equivalents and restricted cash—end of period	233,946	204,981	464,344
Restricted cash at end of period	37,651	65,832	65,853
Cash and cash equivalents and restricted cash	271,597	530,197	615,885
Supplemental disclosures of cash flow information:
Cash paid for interest	76,333	74,160	66,911
Interest capitalized	1,433	1,596	459
Cash paid for income taxes	1,766	4,847	5,783
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	90,910	85,242	71,769
Write-off of fully depreciated assets	30,977	39,665	19,136
Conversion of operating partnership units and Class B shares to Class A shares	27,495	70,779	23,435
Issuance of Series 2019 private perpetual preferred in exchange for common units	21,147	$ 0	$ 0
Right of use assets	29,452
Ground lease liabilities	$ 29,452