Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities
Net income	$ 107,250	$ 79,928	$ 70,210
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	155,211	171,474	145,431
Amortization of deferred finance costs and debt premiums and discount	739	1,698	3,956
Amortization of acquired above and below-market leases, net	(8,795)	(19,353)	(14,095)
Amortization of acquired below-market ground leases	7,831	7,996	4,603
Straight-lining of rental revenue	(30,147)	(21,220)	(39,715)
Equity based compensation	9,729	5,483	3,720
Increase (decrease) in cash flows due to changes in operating assets and liabilities (excluding the effect of acquisitions):
Restricted cash	2,121	2,954	(4,987)
Tenant and other receivables	(3,760)	4,963	3,135
Deferred leasing costs	(22,622)	(31,367)	(12,132)
Prepaid expenses and other assets	(3,289)	(1,956)	(13,052)
Accounts payable and accrued expenses	3,491	(925)	(14,756)
Deferred revenue and other liabilities	824	3,512	6,240
Net cash provided by operating activities	218,583	203,187	138,558
Cash Flows From Investing Activities
Decrease (increase) in restricted cash for investing activities	538	(119)	9,345
Additions to building and improvements	(181,923)	(141,685)	(121,287)
Development costs	(453)	(512)	(527)
Acquisition of real estate property, net of cash received	0	0	(186,588)
Net cash used in investing activities	(181,838)	(142,316)	(299,057)
Cash Flows From Financing Activities
Proceeds from unsecured revolving credit facility	50,000	655,000	0
Repayments of unsecured revolving credit facility	(90,000)	(615,000)	0
Proceeds from mortgage notes payable	50,000	0	191,000
Repayment of mortgage notes payable	(32,305)	(146,918)	(348,308)
Proceeds from senior unsecured notes	0	350,000	250,000
Proceeds from unsecured term loan	0	265,000	0
Proceeds from term loan and credit facility	0	0	435,600
Repayments of term loan and credit facility	0	(470,000)	(290,600)
Deferred financing costs	(3,006)	(6,100)	(4,483)
Net proceeds from the sale of common stock	611,206	0	0
Private perpetual preferred unit distributions	(936)	(936)	(476)
Dividends paid to common stockholders	(55,812)	(39,183)	(33,598)
Distributions paid to noncontrolling interests in the operating partnership	(58,206)	(51,781)	(53,647)
Net cash provided by (used in) financing activities	470,941	(59,918)	145,488
Net increase (decrease) in cash and cash equivalents	507,686	953	(15,011)
Cash and cash equivalents—beginning of period	46,685	45,732	60,743
Cash and cash equivalents—end of period	554,371	46,685	45,732
Supplemental disclosures of cash flow information:
Cash paid for interest	69,062	64,808	60,621
Cash paid for income taxes	6,238	4,465	3,690
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	66,620	51,315	36,920
Derivative instruments at fair values included in prepaid expenses and other assets	614	0	0
Derivative instruments at fair values included in accounts payable and accrued expenses	5,591	1,922	0
Conversion of operating partnership units and Class B shares to Class A shares	23,678	62,003	40,611
Issuance of Class A Common Stock, Class B Common Stock, and operating partnership units in connection with the acquisition of real estate properties	0	0	379,328
Debt assumed with the acquisition of real estate properties	0	0	182,851
Acquisition of working capital (deficit), net of cash	0	0	(4,749)
Redemption of operating partnership units to repay other receivable	$ 0	$ 0	$ 829