CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Units of partnership interest, amount	289,392
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 53,946	$ 61,595
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	19,532	16,312
Gain on disposal of land, building, and equipment	0	(10,879)
Gain on exchange of non-financial assets	0	(228)
Amortization of financing costs	1,539	1,368
Stock-based compensation expense	2,792	3,037
Changes in assets and liabilities:
Derivative assets and liabilities	(5)	27
Straight-line rent adjustment	(7,008)	(6,857)
Rent received in advance	7,222	5
Other assets and liabilities	3,278	1,601
Net cash provided by operating activities	81,296	65,981
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of real estate investments	(81,136)	(216,272)
Proceeds from sale of real estate investments	0	15,714
Advance deposits on acquisition of operating real estate	(282)	(86)
Net cash used in investing activities	(81,418)	(200,644)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for finance leases	0
Payment of dividends to shareholders	(58,847)	(50,975)
Distributions to non-controlling interests	(267)	(338)
Redemption of non-controlling interests	(3,167)	0
Employee shares withheld for taxes	(2,702)	(166)
Net cash (used in) provided by financing activities	(63,331)	92,182
Net decrease in cash and cash equivalents, including restricted cash	(63,453)	(42,481)
Cash and cash equivalents, including restricted cash, at beginning of period	93,242	69,371
Cash and cash equivalents, including restricted cash, at end of period	29,789	26,890
Noncash Investing and Financing Items [Abstract]
Interest paid	14,075	13,199
Income taxes paid	548	615
Operating lease payments received (lessor)	96,113	0
Operating lease payments remitted (lessee)	312	0
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Dividends declared but not paid	19,641	18,521
Change in fair value of derivative instruments	(13,794)	7,637
At-The-Market Offering [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net proceeds from ATM equity issuance	1,652	47,305
Equity Offering [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net proceeds from ATM equity issuance	$ 0	$ 96,356

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