Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities
Net income	$ 18,058	$ 19,145
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	39,883	40,846
Amortization of non-cash items within interest expense	993	225
Amortization of acquired above- and below-market leases, net	(1,168)	(1,428)
Amortization of acquired below-market ground leases	1,958	1,958
Straight-lining of rental revenue	(5,853)	(5,931)
Equity based compensation	4,555	3,154
Unrealized loss from derivative financial instruments	0	104
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	(3,637)	15
Tenant and other receivables	2,989	1,963
Deferred leasing costs	(7,372)	(7,733)
Prepaid expenses and other assets	25,738	17,867
Accounts payable and accrued expenses	(4,176)	(8,141)
Deferred revenue and other liabilities	(3,408)	(1,115)
Net cash provided by operating activities	68,560	60,929
Cash Flows From Investing Activities
Development costs	0	(26)
Additions to building and improvements	(44,112)	(47,040)
Net cash used in investing activities	(44,112)	(47,066)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	160,000	0
Repayment of mortgage notes payable	(263,863)	(3,167)
Proceeds from unsecured revolving credit facility and term loan	335,000	0
Deferred financing costs	(1,821)	(45)
Private perpetual preferred unit distributions	(234)	(234)
Dividends paid to common stockholders	(17,207)	(16,482)
Distributions paid to non-controlling interests in the operating partnership	(14,350)	(14,914)
Net cash provided (used in) by financing activities	197,525	(34,842)
Net increase (decrease) in cash and cash equivalents and restricted cash	221,973	(20,979)
Cash and cash equivalents and restricted cash—beginning of period	530,197	615,885
Cash and cash equivalents and restricted cash—end of period	752,170	594,906
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	464,344	554,371
Restricted cash at beginning of period	65,853	61,514
Cash and cash equivalents at end of period	690,471	532,442
Restricted cash at end of period	61,699	62,464
Supplemental disclosures of cash flow information:
Cash paid for interest	16,989	19,073
Cash paid for income taxes	659	507
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	74,008	67,614
Derivative instruments at fair values included in prepaid expenses and other assets	4,103	1,547
Derivative instruments at fair values included in accounts payable and accrued expenses	0	5,234
Conversion of operating partnership units and Class B shares to Class A shares	$ 10,089	$ 7,809