Related Party Transactions and Arrangements (Narrative) (Details) $ in Thousands					12 Months Ended
	May 30, 2019	Mar. 19, 2019 USD ($) quarter	Sep. 06, 2016	Apr. 29, 2015	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Vesting and conversion of Class B Units					$ 0	$ 15,786	$ 0
Term of lease contract					1 year
Ineligible termination period			60 years
Asset management fees to related party					$ 25,695	23,143	20,908
Related Party Transaction, Variable Management Fee | Advisor
Related Party Transaction [Line Items]
Advisor fees					100
Acquisition fees and related cost reimbursements
Related Party Transaction [Line Items]
Asset management fees to related party					241	318	$ 180
Property Management Fee | Property Manager
Related Party Transaction [Line Items]
Related party transaction, percentage of loan amount recovered	0.50%
Advisory Agreement | Advisor
Related Party Transaction [Line Items]
Related party transaction term				20 years
Vesting and conversion of Class B Units
Related Party Transaction [Line Items]
Vesting and conversion of Class B Units						$ 15,800
American Realty Capital Advisors | Advisor
Related Party Transaction [Line Items]
Advisor fees					$ 7,400
American Realty Capital Advisors | Salaries, Wages, Benefits And Overhead | Advisor
Related Party Transaction [Line Items]
Advisor fees		$ 7,000
Related party fee, reimbursement of executive salary, variable component, number of quarters | quarter		4
Related party fee, reimbursement of executive salary, variable component, multiplier, percent		0.20%
Related party fee, reimbursement of executive salary, annual cost of living adjustment, percent		3.00%
Reimbursement of executive salary, reduction of real estate cost		25.00%
Reimbursement of executive salary, reduction of real estate cost		12 months
Reimbursement of executive salary, negotiation period		90 days