Stockholders’ Equity - (Schedule of Common Stock) (Details) - shares				3 Months Ended	6 Months Ended	12 Months Ended					23 Months Ended	71 Months Ended
	Jan. 09, 2019	Oct. 10, 2018	Jul. 20, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2018	Jul. 03, 2018	Jun. 30, 2018
Class of Stock [Line Items]
Shares of common stock (in shares)					105,011,556		105,011,556					105,011,556		105,049,705
Common stock, outstanding (in shares)					106,230,901	108,475,266	106,230,901					106,230,901		105,058,793
Common stock repurchases (in shares)							412,939	1,225,365	7,854	1,769,738	303,907	3,719,803
Class A
Class of Stock [Line Items]
Shares of common stock (in shares)					78,749,079		78,749,079					78,749,079
Common stock, outstanding (in shares)					79,966,215		79,966,215					79,966,215
Class B-1
Class of Stock [Line Items]
Common stock, outstanding (in shares)						0
Class B2
Class of Stock [Line Items]
Shares of common stock (in shares)					26,262,477		26,262,477					26,262,477
Common stock, outstanding (in shares)					26,264,686	0	26,264,686					26,264,686
Restricted Stock
Class of Stock [Line Items]
Unvested restricted shares (in shares)					136,234		136,234					136,234		9,088
Restricted Stock | Class A
Class of Stock [Line Items]
Unvested restricted shares (in shares)					134,025		134,025					134,025
Restricted Stock | Class B2
Class of Stock [Line Items]
Unvested restricted shares (in shares)					2,209		2,209					2,209
Class A Units
Class of Stock [Line Items]
Unvested restricted shares (in shares)													203,612
Vesting and conversion of Class B Units
Class of Stock [Line Items]
Vesting and conversion of Class B Units (in shares)					1,052,420
Vesting and conversion of Class B Units | Class A
Class of Stock [Line Items]
Vesting and conversion of Class B Units (in shares)					1,052,420
Redemption of Class A Units (formerly known as OP Units)
Class of Stock [Line Items]
Vesting and conversion of Class B Units (in shares)					30,691
Redemption of Class A Units (in shares)			30,691
Redemption of Class A Units (formerly known as OP Units) | Class A
Class of Stock [Line Items]
Vesting and conversion of Class B Units (in shares)					30,691
Fractional Shares Repurchased As Result Of Stock Split | Class A
Class of Stock [Line Items]
Common stock repurchases (in shares)				18,460
Fractional Shares Repurchased As Result Of Automatic Conversion | Class B-1
Class of Stock [Line Items]
Common stock repurchases (in shares)		19,945
Fractional Shares Repurchased As Result Of Automatic Conversion | Class B2
Class of Stock [Line Items]
Common stock repurchases (in shares)	19,870
Special Limited Partner | American Realty Capital Trust V Special Limited Partner, LLC
Class of Stock [Line Items]
Common stock held by related party (in shares)														8,888
Special Limited Partner | American Realty Capital Trust V Special Limited Partner, LLC | Class A
Class of Stock [Line Items]
Common stock held by related party (in shares)					2,222		2,222					2,222
Individual Members Of Special Limited Partner | American Realty Capital Trust V Special Limited Partner, LLC | Class A
Class of Stock [Line Items]
Common stock held by related party (in shares)														4,444
Restricted Share Plan | Restricted Stock
Class of Stock [Line Items]
Unvested restricted shares (in shares)					136,234	111,421	136,234	15,708	9,367			136,234
LTIP units granted (in shares)				127,402		34,588	127,402	8,897
Independent Director | Restricted Stock
Class of Stock [Line Items]
Shares of common stock (in shares)														7