CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Accumulated Distributions in Excess of Earnings	Accumulated Other Comprehensive (Loss) Income	Cumulative effect of accounting changes	Cumulative effect of accounting changes Accumulated Distributions in Excess of Earnings
Balance, (shares) at Dec. 31, 2018		311,381,396
Balance at Dec. 31, 2018	$ 1,816,850	$ 3,114	$ 2,607,330	$ (804,617)	$ 11,023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (shares)		2,267,609
Issuance of common stock	21,247	$ 22	21,225
Equity-based compensation	32		32
Distributions declared on common stock	(47,963)			(47,963)
Redemptions of common stock (shares)		(2,318,505)
Redemptions of common stock	(21,724)	$ (23)	(21,701)
Changes in redeemable common stock	(67)		(67)
Comprehensive (loss) income	3,496			8,817	(5,321)
Balance, (shares) at Mar. 31, 2019		311,330,500
Balance at Mar. 31, 2019	1,771,871	$ 3,113	2,606,819	(843,763)	5,702
Balance, (shares) at Dec. 31, 2018		311,381,396
Balance at Dec. 31, 2018	1,816,850	$ 3,114	2,607,330	(804,617)	11,023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	3,238
Balance, (shares) at Jun. 30, 2019		311,325,669
Balance at Jun. 30, 2019	1,723,158	$ 3,113	2,606,851	(883,277)	(3,529)
Balance, (shares) at Mar. 31, 2019		311,330,500
Balance at Mar. 31, 2019	1,771,871	$ 3,113	2,606,819	(843,763)	5,702
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (shares)		2,436,153
Issuance of common stock	21,073	$ 25	21,048
Equity-based compensation	32		32
Distributions declared on common stock	(48,487)			(48,487)
Redemptions of common stock (shares)		(2,440,984)
Redemptions of common stock	(21,115)	$ (25)	(21,090)
Changes in redeemable common stock	42		42
Comprehensive (loss) income	(258)			8,973	(9,231)
Balance, (shares) at Jun. 30, 2019		311,325,669
Balance at Jun. 30, 2019	$ 1,723,158	$ 3,113	2,606,851	(883,277)	(3,529)
Balance, (shares) at Dec. 31, 2019	311,207,725	311,207,725.099
Balance at Dec. 31, 2019	$ 1,789,948	$ 3,112	2,606,925	(816,181)	(3,908)	$ (2,002)	$ (2,002)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (shares)		2,223,298
Issuance of common stock	19,231	$ 22	19,209
Equity-based compensation	40		40
Distributions declared on common stock	(48,332)			(48,332)
Redemptions of common stock (shares)		(2,256,037)
Redemptions of common stock	(19,514)	$ (22)	(19,492)
Changes in redeemable common stock	283		283
Comprehensive (loss) income	(22,003)			(12,175)	(9,828)
Balance, (shares) at Mar. 31, 2020		311,174,986
Balance at Mar. 31, 2020	$ 1,717,651	$ 3,112	2,606,965	(878,690)	(13,736)
Balance, (shares) at Dec. 31, 2019	311,207,725	311,207,725.099
Balance at Dec. 31, 2019	$ 1,789,948	$ 3,112	2,606,925	(816,181)	(3,908)	$ (2,002)	$ (2,002)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	$ (23,191)
Balance, (shares) at Jun. 30, 2020	309,948,707	309,948,707.099
Balance at Jun. 30, 2020	$ 1,703,426	$ 3,099	2,607,013	(895,508)	(11,178)
Balance, (shares) at Mar. 31, 2020		311,174,986
Balance at Mar. 31, 2020	1,717,651	$ 3,112	2,606,965	(878,690)	(13,736)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (shares)		1,242,475
Issuance of common stock	9,543	$ 12	9,531
Equity-based compensation	40		40
Distributions declared on common stock	(13,072)			(13,072)
Redemptions of common stock (shares)		(2,468,754)
Redemptions of common stock	(19,191)	$ (25)	(19,166)
Changes in redeemable common stock	9,643		9,643
Comprehensive (loss) income	$ (1,188)			(3,746)	2,558
Balance, (shares) at Jun. 30, 2020	309,948,707	309,948,707.099
Balance at Jun. 30, 2020	$ 1,703,426	$ 3,099	$ 2,607,013	$ (895,508)	$ (11,178)