CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Common Stock	Additional Paid-in Capital	Cumulative Distributions in Excess of Net Income (Loss)	Noncontrolling Interest
Balance (in shares) at Dec. 31, 2018			177,523,853
Balance at Dec. 31, 2018	$ 930,895	$ 930,612	$ 1,775	$ 1,555,380	$ (626,543)	$ 283
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(54,810)	(54,793)			(54,793)	(17)
Issuance of common stock (in shares)			2,317,868
Issuance of common stock	26,471	26,471	$ 23	26,448
Transfers from redeemable common stock	24,028	24,028		24,028
Redemptions of common stock (in shares)			(4,840,160)
Redemptions of common stock	(55,550)	(55,550)	$ (48)	(55,502)
Distributions declared	(56,927)	(56,927)			(56,927)
Other offering costs	(3)	(3)		(3)
Balance (in shares) at Jun. 30, 2019			175,001,561
Balance at Jun. 30, 2019	814,104	813,838	$ 1,750	1,550,351	(738,263)	266
Balance (in shares) at Mar. 31, 2019			174,110,694
Balance at Mar. 31, 2019	870,683	870,408	$ 1,741	1,550,411	(681,744)	275
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(28,124)	(28,115)			(28,115)	(9)
Issuance of common stock (in shares)			1,136,045
Issuance of common stock	12,974	12,974	$ 11	12,963
Transfers to redeemable common stock	(10,080)	(10,080)		(10,080)
Redemptions of common stock (in shares)			(245,178)
Redemptions of common stock	(2,944)	(2,944)	$ (2)	(2,942)
Distributions declared	(28,404)	(28,404)			(28,404)
Other offering costs	(1)	(1)		(1)
Balance (in shares) at Jun. 30, 2019			175,001,561
Balance at Jun. 30, 2019	$ 814,104	813,838	$ 1,750	1,550,351	(738,263)	266
Balance (in shares) at Dec. 31, 2019	180,970,743		180,970,743
Balance at Dec. 31, 2019	$ 985,310	985,055	$ 1,810	1,600,416	(617,171)	255
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(13,250)	(19,395)			(19,395)	6,145
Issuance of common stock (in shares)			2,133,957
Issuance of common stock	23,622	23,622	$ 21	23,601
Transfers to redeemable common stock	(17,355)	(17,355)		(17,355)
Redemptions of common stock (in shares)			(540,092)
Redemptions of common stock	(6,292)	(6,292)	$ (5)	(6,287)
Distributions declared	(54,417)	(54,417)			(54,417)
Other offering costs	(12)	(12)		(12)
Distribution to noncontrolling interest	$ (6,400)	0				(6,400)
Balance (in shares) at Jun. 30, 2020	182,564,608		182,564,608
Balance at Jun. 30, 2020	$ 911,206	911,206	$ 1,826	1,600,363	(690,983)	0
Balance (in shares) at Mar. 31, 2020			181,784,482
Balance at Mar. 31, 2020	899,233	898,977	$ 1,818	1,600,382	(703,223)	256
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	45,652	39,508			39,508	6,144
Issuance of common stock (in shares)			1,058,508
Issuance of common stock	11,718	11,718	$ 10	11,708
Transfers to redeemable common stock	(8,475)	(8,475)		(8,475)
Redemptions of common stock (in shares)			(278,382)
Redemptions of common stock	(3,243)	(3,243)	$ (2)	(3,241)
Distributions declared	(27,268)	(27,268)			(27,268)
Other offering costs	(11)	(11)		(11)
Distribution to noncontrolling interest	$ (6,400)	0				(6,400)
Balance (in shares) at Jun. 30, 2020	182,564,608		182,564,608
Balance at Jun. 30, 2020	$ 911,206	$ 911,206	$ 1,826	$ 1,600,363	$ (690,983)	$ 0