Organization, Basis of Presentation and Summary of Significant Accounting Policies (Supplemental Cash Flow Disclosure) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other non-cash investing and financing activities [Abstract]
Cash paid on gross receipts and income for federal and state purposes	$ 275	$ 291	$ 253
Interest paid	60,319	60,494	46,271
Issuance of OP Units in connection with acquisitions	0	0	49,599
Fair value of assumed mortgages upon acquisition	0	0	46,801
Intangible lease liabilities	0	1,680	48,684
Interest rate swap asset	(4,931)	610	3,446
Interest rate swap liabilities	3,285	580	0
Accrued real estate improvement costs	3,222	2,200	3,568
Equity redemption of OP Units	2,632	0	50,155
Disposition of real estate through issuance of mortgage note	$ 13,250	$ 0	$ 0