Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities
Net income	$ 77,472	$ 85,993
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	121,826	119,868
Amortization of non-cash items within interest expense	5,142	919
Amortization of acquired above- and below-market leases, net	(4,387)	(4,154)
Amortization of acquired below-market ground leases	5,873	5,873
Straight-lining of rental revenue	(16,662)	(20,590)
Equity based compensation	14,064	10,808
Settlement of derivative contracts	0	(6,335)
Unrealized loss from derivative financial instruments	0	2,157
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	(4,566)	213
Tenant and other receivables	(3,176)	(12,119)
Deferred leasing costs	(18,578)	(21,660)
Prepaid expenses and other assets	20,308	13,672
Accounts payable and accrued expenses	(1,181)	(8,917)
Deferred revenue and other liabilities	(8,732)	9,108
Net cash provided by operating activities	187,403	174,836
Cash Flows From Investing Activities
Short-term investments	(400,000)	0
Development costs	(1)	(27)
Additions to building and improvements	(169,622)	(157,579)
Net cash used in investing activities	(569,623)	(157,606)
Cash Flows From Financing Activities
Proceeds from mortgage notes payable	160,000	315,000
Repayment of mortgage notes payable	(265,688)	(344,618)
Proceeds from unsecured senior notes	335,000	0
Proceeds from unsecured revolving credit facility and term loan	0	265,000
Repayments of unsecured revolving credit facility and term loan	0	(265,000)
Proceeds from the sale of common stock	4,749	0
Deferred financing costs	(1,977)	(12,186)
Private perpetual preferred unit distributions	(702)	(702)
Dividends paid to common stockholders	(52,518)	(49,843)
Distributions paid to non-controlling interests in the operating partnership	(42,740)	(44,641)
Net cash provided by (used in) financing activities	136,124	(136,990)
Net decrease in cash and cash equivalents and restricted cash	(246,096)	(119,760)
Cash and cash equivalents and restricted cash—beginning of period	530,197	615,885
Cash and cash equivalents and restricted cash—end of period	284,101	496,125
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	229,745	432,105
Restricted cash at end of period	54,356	64,020
Supplemental disclosures of cash flow information:
Cash paid for interest	56,597	53,918
Cash paid for income taxes	3,690	5,004
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	92,506	72,130
Derivative instruments at fair values included in prepaid expenses and other assets	9,944	0
Derivative instruments at fair values included in accounts payable and accrued expenses	0	13,378
Conversion of operating partnership units and Class B shares to Class A shares	$ 31,660	$ 11,087