Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities
Net income	$ 28,786	$ 48,242
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	90,919	79,351
Amortization of non-cash items within interest expense	4,147	3,069
Amortization of acquired above- and below-market leases, net	(4,098)	(2,719)
Amortization of acquired below-market ground leases	3,916	3,916
Straight-lining of rental revenue	(8,607)	(11,662)
Equity based compensation	11,745	9,211
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	(25,420)	(4,278)
Tenant and other receivables	(1,827)	6,601
Deferred leasing costs	(10,892)	(10,349)
Prepaid expenses and other assets	993	2,351
Accounts payable and accrued expenses	(4,430)	(2,691)
Deferred revenue and other liabilities	4,048	(11,355)
Net cash provided by operating activities	89,280	109,687
Cash Flows From Investing Activities
Short-term investments	250,000	(400,000)
Development costs	0	(1)
Additions to building and improvements	(130,648)	(98,567)
Net cash provided by (used in) investing activities	119,352	(498,568)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	0	160,000
Repayment of mortgage notes payable	(1,877)	(264,771)
Proceeds from unsecured senior notes	0	335,000
Proceeds from the sale of common stock	0	4,749
Deferred financing costs	0	(1,902)
Private perpetual preferred unit distributions	(468)	(468)
Dividends paid to common stockholders	(37,191)	(34,792)
Distributions paid to non-controlling interests in the operating partnership	(26,531)	(28,616)
Net cash provided by (used in) financing activities	(66,067)	169,200
Net increase in cash and cash equivalents and restricted cash	142,565	(219,681)
Cash and cash equivalents and restricted cash—beginning of period	270,813	530,197
Cash and cash equivalents and restricted cash—end of period	413,378	310,516
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	204,981	464,344
Restricted cash at beginning of period	65,832	65,853
Cash and cash equivalents at end of period	375,335	251,797
Restricted cash at end of period	38,043	58,719
Supplemental disclosures of cash flow information:
Cash paid for interest	38,363	35,956
Cash paid for income taxes	1,441	2,703
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	74,887	96,439
Write-off of fully depreciated assets	11,123	19,049
Derivative instruments at fair values included in prepaid expenses and other assets	0	6,018
Derivative instruments at fair values included in accounts payable and accrued expenses	22,895	0
Conversion of operating partnership units and Class B shares to Class A shares	8,858	$ 25,845
Right of use assets	29,452
Ground lease liabilities	$ 29,452