Related Party Transactions and Arrangements (Fees and Participations Incurred in Connection With the Operations of the Company) (Details)						6 Months Ended	12 Months Ended
	May 30, 2019	Jul. 03, 2018 $ / shares	Sep. 06, 2016 USD ($) $ / shares	Sep. 05, 2016 USD ($)	Apr. 29, 2015	Jul. 02, 2018 shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) property agreement	Dec. 31, 2017 USD ($)	Jan. 15, 2016
Related Party Transaction [Line Items]
Vesting and conversion of Class B Units							$ 0	$ 15,786,000	$ 0
Term of lease contract							1 year
Ineligible termination period			60 years
Asset management fees to related party							$ 25,695,000	23,143,000	20,908,000
Advisor
Related Party Transaction [Line Items]
Percentage of independent directors approval needed to terminate agreement			67.00%
Internalization fee percentage payable in equity			10.00%
Variable management fee, percent of quarterly earnings, benchmark one							15.00%
Basis for variable management fee, benchmark one (in usd per share) | $ / shares							$ 0.375
Variable management fee, percent of quarterly earnings, benchmark two							10.00%
Basis for variable management fee, benchmark two (in usd per share) | $ / shares							$ 0.50
American Realty Capital Advisors | Advisor
Related Party Transaction [Line Items]
Advisor fees							$ 7,400,000
American Realty Capital Advisors | Contract Purchase Price | Advisor
Related Party Transaction [Line Items]
Acquisition fees earned by related party percentage										0.50%
Financing advance fees earned by related party percentage										0.50%
Expected third party acquisition costs reimbursable										1.50%
Antidilutive shares (in shares) | shares						1,052,420
Acquisition fees and related cost reimbursements
Related Party Transaction [Line Items]
Asset management fees to related party							241,000	318,000	180,000
Advisory Agreement | Advisor
Related Party Transaction [Line Items]
Related party transaction term					20 years
Base Management Fee | Advisor
Related Party Transaction [Line Items]
Advisor fees				$ 18,000,000.0
Quarterly payments, percent of net proceeds from equity financing			0.10417%	0.375%
Base Management Fee - First Year following Effective Time | Advisor
Related Party Transaction [Line Items]
Advisor fees			$ 21,000,000.0
Transaction multiplier			0.0031
Base Management Fee - Second Year following Effective Time | Advisor
Related Party Transaction [Line Items]
Advisor fees			$ 22,500,000
Transaction multiplier			0.0047
Base Management Fee - Subsequent to Second Year following Effective Time | Advisor
Related Party Transaction [Line Items]
Advisor fees			$ 24,000,000.0
Transaction multiplier			0.0062
Annual Subordinated Performance Fee | Advisor
Related Party Transaction [Line Items]
Earnings per share used in calculation benchmark one (in usd per share) | $ / shares		$ 0.275	$ 0.375
Earnings per share used in calculation benchmark two (in usd per share) | $ / shares		$ 0.3125	$ 0.50
Administrative Services | American Realty Capital Advisors | Advisor
Related Party Transaction [Line Items]
Asset management fees to related party							$ 9,800,000	$ 8,600,000	$ 7,800,000
Termination Fees for Agreement | Advisor
Related Party Transaction [Line Items]
Advisor fees			$ 15,000,000.0
Base Subject Fees Spread | Advisor
Related Party Transaction [Line Items]
Transaction multiplier			4
Subject Fees | Advisor
Related Party Transaction [Line Items]
Transaction multiplier			4.5
Subject Fees - Applicable if Internalization Occurs On or After January 1, 2029 | Advisor
Related Party Transaction [Line Items]
Transaction multiplier			3.5
Basis Spread - Purchase Price | Advisor
Related Party Transaction [Line Items]
Related party fee, quarterly payments, percent of net proceeds from equity financing			1.00%
Property Management Fee
Related Party Transaction [Line Items]
Number of property management agreements | agreement								12
Property Management Fee | Property Manager
Related Party Transaction [Line Items]
Percentage of gross rental receipts			4.00%
Percentage of reimbursable administrative charges			15.00%
Related Party Transaction, Percentage of Allocated Loan Not Related to Specially Service Properties	0.02083%
Related Party Transaction, Percentage of Allocated Loan Including Amount Related to Specially Service Properties	0.0625%
Transition Fees | Property Manager
Related Party Transaction [Line Items]
Advisor fees			$ 2,500
Construction fee percentage			6.00%
Vesting and conversion of Class B Units
Related Party Transaction [Line Items]
Vesting and conversion of Class B Units								$ 15,800,000
Secured Debt | Property Management Fee
Related Party Transaction [Line Items]
Mortgage loan								$ 210,000,000.0
Number of properties | property								12