CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustments	Class A	Class C	Total CPA:18 – Global Stockholders	Total CPA:18 – Global Stockholders Cumulative Effect, Period of Adoption, Adjustments	Common Stock Class A	Common Stock Class C	Additional Paid-In Capital	Distributions and Accumulated Losses	Distributions and Accumulated Losses Cumulative Effect, Period of Adoption, Adjustments	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning equity balance, value at Dec. 31, 2018	$ 895,970				$ 828,977		$ 114	$ 32	$ 1,290,888	$ (411,464)		$ (50,593)	$ 66,993
Beginning equity balance, value (ASU 2016-02) at Dec. 31, 2018		$ (1,108)				$ (1,108)					$ (1,108)
Beginning equity balance, shares at Dec. 31, 2018							114,589,333	31,641,265
Statements of Equity
Shares issued	21,970				21,970		$ 2	$ 1	21,967
Shares issued, shares							1,925,165	591,233
Shares issued to affiliate	3,360				3,360				3,360
Shares issued to affiliate, shares							384,947
Contributions from noncontrolling interests	2,520												2,520
Distributions to noncontrolling interests	(13,548)												(13,548)
Distributions declared	(44,955)				(44,955)					(44,955)
Net loss (income)	24,851				17,905					17,905			6,946
Other comprehensive (loss) income:
Foreign currency translation adjustments	(584)				(757)							(757)	173
Unrealized loss on derivative instruments	(2,209)				(2,209)							(2,209)
Repurchase of shares	(9,294)				(9,294)		$ (1)	$ (1)	(9,292)
Repurchase of shares, shares							(866,117)	(229,884)
Ending equity balance, value at Jun. 30, 2019	876,973				813,889		$ 115	$ 32	1,306,923	(439,622)		(53,559)	63,084
Ending equity balance, shares at Jun. 30, 2019							116,033,328	32,002,614
Beginning equity balance, value at Dec. 31, 2018	895,970				828,977		$ 114	$ 32	1,290,888	(411,464)		(50,593)	66,993
Beginning equity balance, value (ASU 2016-02) at Dec. 31, 2018		(1,108)				(1,108)					(1,108)
Beginning equity balance, shares at Dec. 31, 2018							114,589,333	31,641,265
Ending equity balance, value at Dec. 31, 2019	$ 851,671				792,872		$ 117	$ 32	1,319,584	(470,326)		(56,535)	58,799
Ending equity balance, value (ASU 2016-13) at Dec. 31, 2019		$ (6,903)				$ (6,903)					$ (6,903)
Ending equity balance, shares at Dec. 31, 2019			117,179,578	32,238,513			117,179,578	32,238,513
Other comprehensive (loss) income:
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning equity balance, value at Mar. 31, 2019	$ 890,552				825,294		$ 115	$ 32	1,300,223	(420,161)		(54,915)	65,258
Beginning equity balance, shares at Mar. 31, 2019							115,444,107	31,840,141
Statements of Equity
Shares issued	10,950				10,950		$ 1		10,949
Shares issued, shares							959,968	294,171
Shares issued to affiliate	1,438				1,438				1,438
Shares issued to affiliate, shares							164,709
Distributions to noncontrolling interests	(4,605)												(4,605)
Distributions declared	(22,539)				(22,539)					(22,539)
Net loss (income)	5,178				3,078					3,078			2,100
Other comprehensive (loss) income:
Foreign currency translation adjustments	3,658				3,327							3,327	331
Unrealized loss on derivative instruments	(1,971)				(1,971)							(1,971)
Repurchase of shares	(5,688)				(5,688)		$ (1)		(5,687)
Repurchase of shares, shares							(535,456)	(131,698)
Ending equity balance, value at Jun. 30, 2019	876,973				813,889		$ 115	$ 32	1,306,923	(439,622)		(53,559)	63,084
Ending equity balance, shares at Jun. 30, 2019							116,033,328	32,002,614
Beginning equity balance, value at Dec. 31, 2019	851,671				792,872		$ 117	$ 32	1,319,584	(470,326)		(56,535)	58,799
Beginning equity balance, shares at Dec. 31, 2019			117,179,578	32,238,513			117,179,578	32,238,513
Statements of Equity
Shares issued	21,873				21,873		$ 2		21,871
Shares issued, shares							1,903,909	580,538
Shares issued to affiliate	3,982				3,982				3,982
Shares issued to affiliate, shares							457,697
Contributions from noncontrolling interests	595												595
Distributions to noncontrolling interests	(4,863)												(4,863)
Distributions declared	(31,653)				(31,653)					(31,653)
Net loss (income)	(3,230)				(9,371)					(9,371)			6,141
Other comprehensive (loss) income:
Foreign currency translation adjustments	(11,776)				(10,647)							(10,647)	(1,129)
Unrealized loss on derivative instruments	(2,767)				(2,764)							(2,764)	(3)
Repurchase of shares	(14,413)				(14,413)		$ (1)	$ 0	(14,412)
Repurchase of shares, shares							(1,281,324)	(449,448)
Ending equity balance, value at Jun. 30, 2020	$ 802,516				742,976		$ 118	$ 32	1,331,025	(518,253)		(69,946)	59,540
Ending equity balance, shares at Jun. 30, 2020			118,259,860	32,369,603			118,259,860	32,369,603
Other comprehensive (loss) income:
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning equity balance, value at Mar. 31, 2020	$ 791,933				735,811		$ 117	$ 32	1,323,827	(508,253)		(79,912)	56,122
Beginning equity balance, shares at Mar. 31, 2020							117,627,430	32,263,611
Statements of Equity
Shares issued	10,934				10,934		$ 1		10,933
Shares issued, shares							937,611	289,651
Shares issued to affiliate	2,503				2,503		$ 1		2,502
Shares issued to affiliate, shares							288,652
Distributions to noncontrolling interests	(1,508)												(1,508)
Distributions declared	(8,809)				(8,809)					(8,809)
Net loss (income)	2,339				(1,191)					(1,191)			3,530
Other comprehensive (loss) income:
Foreign currency translation adjustments	12,306				10,910							10,910	1,396
Unrealized loss on derivative instruments	(944)				(944)							(944)
Repurchase of shares	(6,238)				(6,238)		$ (1)		(6,237)
Repurchase of shares, shares							(593,833)	(183,659)
Ending equity balance, value at Jun. 30, 2020	$ 802,516				$ 742,976		$ 118	$ 32	$ 1,331,025	$ (518,253)		$ (69,946)	$ 59,540
Ending equity balance, shares at Jun. 30, 2020			118,259,860	32,369,603			118,259,860	32,369,603