Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Operating Activities
Net income	$ 9,856	$ 18,058
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46,098	39,883
Amortization of non-cash items within interest expense	2,074	993
Amortization of acquired above- and below-market leases, net	(2,354)	(1,168)
Amortization of acquired below-market ground leases	1,958	1,958
Straight-lining of rental revenue	(5,404)	(5,853)
Equity based compensation	5,419	4,555
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	(1,243)	(3,637)
Tenant and other receivables	7,385	2,989
Deferred leasing costs	(3,270)	(7,372)
Prepaid expenses and other assets	24,046	25,738
Accounts payable and accrued expenses	(5,192)	(4,176)
Deferred revenue and other liabilities	(1,471)	(3,408)
Net cash provided by operating activities	77,902	68,560
Cash Flows From Investing Activities
Short-term investments	50,000	0
Additions to building and improvements	(61,163)	(44,112)
Net cash used in investing activities	(11,163)	(44,112)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	0	160,000
Repayment of mortgage notes payable	(934)	(263,863)
Proceeds from unsecured senior notes	0	335,000
Deferred financing costs	0	(1,821)
Private perpetual preferred unit distributions	(234)	(234)
Dividends paid to common stockholders	(18,520)	(17,207)
Distributions paid to non-controlling interests in the operating partnership	(13,188)	(14,350)
Net cash provided by (used in) financing activities	(32,876)	197,525
Net increase in cash and cash equivalents and restricted cash	33,863	221,973
Cash and cash equivalents and restricted cash—beginning of period	270,813	530,197
Cash and cash equivalents and restricted cash—end of period	304,676	752,170
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	242,910	690,471
Restricted cash at end of period	61,766	61,699
Supplemental disclosures of cash flow information:
Cash paid for interest	20,768	16,989
Cash paid for income taxes	1,075	659
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	82,399	74,008
Write-off of fully depreciated assets	6,126	8,922
Derivative instruments at fair values included in prepaid expenses and other assets	3	4,103
Derivative instruments at fair values included in accounts payable and accrued expenses	10,336	0
Conversion of operating partnership units and Class B shares to Class A shares	3,282	$ 10,089
Right of use assets	29,452
Ground lease liabilities	$ 29,452