CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 58,760	$ 39,472
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	77,978	71,209
Amortization of above/below market leases	(417)	(387)
Amortization of deferred financing costs	964	999
Gain on real estate disposal		(36)
Share-based compensation	6,874	5,305
Bad debt expense	272	310
Changes in operating assets and liabilities:
Accounts receivable	(4,140)	(4,214)
Deferred rent receivable	(1,906)	(5,423)
Deferred leasing costs	(10,534)	(11,242)
Other assets	(8,499)	(4,661)
Accounts payable and accrued expenses	1,413	4,045
Unearned revenue, prepaid rent and other liabilities	2,480	8,799
Deferred rent payable	(356)	(737)
Net cash provided by operating activities	122,889	103,439
CASH FLOWS FROM INVESTING ACTIVITIES
Tenant improvements	(3,487)	(5,356)
Real estate improvements	(234,963)	(72,443)
Escrow deposits	(4,075)
Proceeds from real estate disposal		2,399
Net cash used in investing activities	(242,525)	(75,400)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	1,243	1,171
Proceeds from revolving credit facility	200,250	55,000
Payments on revolving credit facility	(247,750)	(163,250)
Proceeds from unsecured term loan	250,000	150,000
Payments of loan fees and costs	(2,981)	(2,315)
Payments to net settle equity awards		(4,256)
Dividends and distributions	(81,684)	(65,574)
Net cash provided by (used in) financing activities	119,078	(29,224)
Net change in cash and cash equivalents	(558)	(1,185)
Cash and cash equivalents, beginning of period	6,854	10,662
Cash and cash equivalents, end of period	6,296	9,477
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest, net of capitalized amounts	5,912	4,501
NON-CASH INVESTING AND FINANCING ACTIVITY
Construction in Progress Expenditures Incurred but Not yet Paid	46,048	18,943
Accrual of dividends and distributions	$ 28,630	$ 22,688