CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 106,763	$ 100,491	$ 81,921
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	141,633	129,251	108,652
Amortization of above/below market leases	(580)	(598)	(541)
Amortization of deferred financing costs	2,370	1,676	1,333
Share-based compensation	12,038	8,946	8,892
Bad debt expense	(229)	1,338	398
Changes in operating assets and liabilities:
Accounts receivable	10,923	(5,087)	(13,199)
Deferred rent receivable	(3,124)	(3,645)	(7,083)
Deferred leasing costs	(11,672)	(13,315)	(14,395)
Other assets	(4,079)	(10,924)	(8,819)
Accounts payable and accrued expenses	3,502	1,224	4,910
Unearned revenue, prepaid rent and other liabilities	(1,275)	(2,235)	8,696
Operating leases	2,491	2,234	(240)
Net cash provided by operating activities	258,761	209,356	170,525
CASH FLOWS FROM INVESTING ACTIVITIES
Tenant improvements	(5,247)	(7,850)	(5,878)
Real estate improvements	(239,715)	(153,956)	(293,359)
Business combinations and asset acquisitions	(10,681)	(12,158)	(64,965)
Net cash used in investing activities	(255,643)	(173,964)	(364,202)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	310	4,820	1,290
Proceeds from revolving credit facility	253,036	274,000	299,500
Payments on revolving credit facility	(211,036)	(298,500)	(247,750)
Proceeds from unsecured debt	150,000	275,000	250,000
Payments of loan fees and costs	(5,038)	(2,410)	(2,981)
Redemption of preferred stock		(115,000)
Dividends and distributions	(193,038)	(172,484)	(108,807)
Net cash provided by (used in) financing activities	(5,766)	(34,574)	191,252
Net change in cash and cash equivalents	(2,648)	818	(2,425)
Cash and cash equivalents, beginning of year	5,247	4,429	6,854
Cash and cash equivalents, end of year	2,599	5,247	4,429
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest, net of capitalized amounts	32,579	22,252	11,528
Cash paid for operating lease liabilities	21,994	20,764	20,184
NON-CASH INVESTING AND FINANCING ACTIVITY
Construction costs payable capitalized to real estate	41,328	32,228	28,805
Accrual of dividends and distributions	55,679	48,976	41,849
NON-CASH OPERATING ACTIVITY
Lease liabilities arising from obtaining right-of-use assets	$ 114,989	$ 8,330	$ 73,575