RESTATEMENT OF PREVIOUSLY ISSUED CONSOLIDATED FINANCIAL STATEMENTS - Equity Statement (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended										6 Months Ended				9 Months Ended				12 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018		Jun. 30, 2019		Jun. 30, 2018		Sep. 30, 2019		Sep. 30, 2018		Dec. 31, 2019		Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity
Beginning balance		$ 189,475	$ 196,695	$ 203,819	[1]	$ 198,762		$ 196,623	$ 193,361	$ 169,541	[1]	$ 203,819	[1]	$ 169,541	[1]	$ 203,819	[1]	$ 169,541	[1]	$ 203,819	[1]	$ 169,541	[1]
Distributions - Common Stock		(3,554)	(3,220)	(3,221)		(3,190)		(3,190)	(2,970)	(2,897)										(13,636)		(12,247)	[1]
Restricted stock vesting		0	0	0		0		0		0										0		0	[1]
Compensation expense—restricted stock and restricted stock units		372	373	365		320		15	361	297										1,492		995	[1]
Contributions from non-controlling interests		0	0	0		0		0	0	0												0
Distributions to non-controlling interests		(1,134)	(39)	(46)		(35)		(62)	(10)	(2)										(1,257)		(107)	[1]
Purchase of non-controlling interest		0	0	0		0		0	0	(250)												(251)	[1]
Shares issued through equity offering program, net		774	0	0		0		8,489	10,525	1,401										7,518		20,412	[1]
Shares repurchased		0	(46)	0		(120)		(41)	0	0										(46)		(162)
Net income		4,071	(4,273)	(4,213)		8,099		(3,077)	(4,651)	25,254		(8,486)		20,603		(4,415)		17,526		1,693		25,625	[1]
Other comprehensive income (loss)		(3)	(15)	(9)		(17)		5	7	17		(24)		24		(27)		29		(23)		13	[1]
Comprehensive income (loss)		4,068	(4,288)	(4,222)		8,082		(3,072)	(4,644)	25,271		(8,510)		20,627		(4,442)		17,555		1,670		25,638	[1]
Ending balance		$ 190,001	$ 189,475	$ 196,695		$ 203,819	[1]	$ 198,762	$ 196,623	$ 193,361		$ 189,475		$ 196,623		$ 190,001		$ 198,762		$ 199,560		$ 203,819	[1]
Dividends paid (in dollars per share)		$ 0.20	$ 0.20	$ 0.20		$ 0.20		$ 0.20	$ 0.20	$ 0.20		$ 0.20		$ 0.20		$ 0.20		$ 0.20		$ 0.84		$ 0.80
As Previously Reported
Increase (Decrease) in Stockholders' Equity
Beginning balance		$ 276,785	$ 285,518	$ 290,360		$ 296,485		$ 301,486	$ 291,376	$ 243,347		$ 290,360		$ 243,347		$ 290,360		$ 243,347		$ 290,360		$ 243,347
Distributions - Common Stock		(3,554)	(3,220)	(3,221)		(3,190)		(3,190)	(2,970)	(2,897)												(12,247)
Restricted stock vesting		0	0	0		0		0		0												0
Compensation expense—restricted stock and restricted stock units		372	373	365		323		15	361	297												995
Contributions from non-controlling interests		1,237	3,027	264		1,435		0	9,930	18,088												41,824
Distributions to non-controlling interests		(3,510)	(2,264)	(2,345)		(15,070)		(1,525)	(2,163)	(32,020)												(50,777)
Purchase of non-controlling interest		0	0	0		(3,454)		(4,924)	0	(250)												(8,628)
Shares issued through equity offering program, net		774	0	0		0		8,486	10,525	1,401												20,412
Shares repurchased		0	(46)	0		(120)		(41)	0	0												(161)
Net income		3,345	(5,250)	(5,083)		15,310		(4,138)	(5,971)	49,908		(10,333)		43,937		(6,988)		39,799				55,109
Other comprehensive income (loss)		(322)	(1,353)	(869)		(1,359)		316	398	1,132		(2,222)		1,530		(2,544)		1,846				486
Comprehensive income (loss)		3,023	(6,603)	(5,952)		13,951		(3,822)	(5,573)	51,040		(12,555)		45,467		(9,532)		41,645				55,595
Ending balance		275,127	276,785	285,518		290,360		296,485	301,486	291,376		276,785		301,486		275,127		296,485				290,360
Restatement Impact
Increase (Decrease) in Stockholders' Equity
Beginning balance		(87,310)	(88,823)	(86,541)		(97,723)		(104,863)	(98,015)	(73,806)		(86,541)		(73,806)		(86,541)		(73,806)		(86,541)		(73,806)
Distributions - Common Stock		0	0	0		0		0	0	0
Restricted stock vesting		0	0	0		0		0		0
Compensation expense—restricted stock and restricted stock units		0	0	0		(3)		0	0	0
Contributions from non-controlling interests		(1,237)	(3,027)	(264)		(1,435)		0	(9,930)	(18,088)												(41,824)
Distributions to non-controlling interests		2,376	2,225	2,299		15,035		1,463	2,153	32,018												50,670
Purchase of non-controlling interest		0	0	0		3,454		4,924	0	0												8,376
Shares issued through equity offering program, net		0	0	0		0		3	0	0
Shares repurchased		0	0	0		0		0	0	0												0
Net income		726	977	870		(7,211)		1,061	1,320	(24,654)		1,847		(23,334)		2,573		(22,273)				(29,484)
Other comprehensive income (loss)		319	1,338	860		1,342		(311)	(391)	(1,115)		2,198		(1,506)		2,517		(1,817)				(473)
Comprehensive income (loss)		1,045	2,315	1,730		(5,869)		750	929	(25,769)		4,045		(24,840)		5,090		(24,090)				(29,957)
Ending balance		(85,126)	(87,310)	(88,823)		(86,541)		(97,723)	(104,863)	(98,015)		(87,310)		(104,863)		(85,126)		(97,723)				(86,541)
Shares of Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance		152	152	150	[1]	150		144	136	133	[1]	150	[1]	133	[1]	150	[1]	133	[1]	150	[1]	133	[1]
Restricted stock vesting				2						1										1		1	[1]
Shares issued through equity offering program, net								6	8	2										4		16	[1]
Ending balance		152	152	152		150	[1]	150	144	136		152		144		152		150		155		150	[1]
Shares of Common Stock | As Previously Reported
Increase (Decrease) in Stockholders' Equity
Beginning balance		152	152	150		150		144	136	133		150		133		150		133		150		133
Restricted stock vesting				2						1												1
Shares issued through equity offering program, net								6	8	2												16
Ending balance		152	152	152		150		150	144	136		152		144		152		150				150
Shares of Common Stock | Restatement Impact
Increase (Decrease) in Stockholders' Equity
Beginning balance		0	0	0		0		0	0	0		0		0		0		0		0		0
Ending balance		0	0	0		0		0	0	0		0		0		0		0				0
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity
Beginning balance		224,063	223,736	223,373	[1]	223,173		214,716	203,838	202,225	[1]	223,373	[1]	202,225	[1]	223,373	[1]	202,225	[1]	223,373	[1]	202,225	[1]
Restricted stock vesting				(2)						(1)										(1)		(1)	[1]
Compensation expense—restricted stock and restricted stock units		372	373	365		320		15	361	297										1,492		995	[1]
Purchase of non-controlling interest										(82)												(80)	[1]
Shares issued through equity offering program, net		774						8,483	10,517	1,399										7,514		20,396	[1]
Shares repurchased			(46)			(120)		(41)												(46)		(162)	[1]
Ending balance		225,209	224,063	223,736		223,373	[1]	223,173	214,716	203,838		224,063		214,716		225,209		223,173		232,332		223,373	[1]
Additional Paid-In Capital | As Previously Reported
Increase (Decrease) in Stockholders' Equity
Beginning balance		217,671	217,344	216,981		220,135		214,716	203,838	202,225		216,981		202,225		216,981		202,225		216,981		202,225
Restricted stock vesting				(2)						(1)												(1)
Compensation expense—restricted stock and restricted stock units		372	373	365		323		15	361	297												995
Purchase of non-controlling interest						(3,357)		(3,035)		(82)												(6,473)
Shares issued through equity offering program, net		774						8,480	10,517	1,399												20,396
Shares repurchased			(46)			(120)		(41)														(161)
Ending balance		218,817	217,671	217,344		216,981		220,135	214,716	203,838		217,671		214,716		218,817		220,135				216,981
Additional Paid-In Capital | Restatement Impact
Increase (Decrease) in Stockholders' Equity
Beginning balance		6,392	6,392	6,392		3,038		0	0	0		6,392		0		6,392		0		6,392		0
Compensation expense—restricted stock and restricted stock units						(3)
Purchase of non-controlling interest						3,357		3,035														6,392
Shares issued through equity offering program, net								3
Ending balance		6,392	6,392	6,392		6,392		3,038	0	0		6,392		0		6,392		3,038				6,392
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity
Beginning balance		(11)	2	9	[1]	24		20	14	(2)	[1]	9	[1]	(2)	[1]	9	[1]	(2)	[1]	9	[1]	(2)	[1]
Other comprehensive income (loss)		(3)	(13)	(7)		(15)		4	6	16										(19)		11	[1]
Ending balance		(14)	(11)	2		9	[1]	24	20	14		(11)		20		(14)		24		(10)		9	[1]
Accumulated Other Comprehensive Income (Loss) | As Previously Reported
Increase (Decrease) in Stockholders' Equity
Beginning balance		143	1,082	1,688		2,629		2,408	2,132	1,346		1,688		1,346		1,688		1,346		1,688		1,346
Other comprehensive income (loss)		(218)	(939)	(606)		(941)		221	276	786												342
Ending balance		(75)	143	1,082		1,688		2,629	2,408	2,132		143		2,408		(75)		2,629				1,688
Accumulated Other Comprehensive Income (Loss) | Restatement Impact
Increase (Decrease) in Stockholders' Equity
Beginning balance		(154)	(1,080)	(1,679)		(2,605)		(2,388)	(2,118)	(1,348)		(1,679)		(1,348)		(1,679)		(1,348)		(1,679)		(1,348)
Other comprehensive income (loss)		215	926	599		926		(217)	(270)	(770)												(331)
Ending balance		61	(154)	(1,080)		(1,679)		(2,605)	(2,388)	(2,118)		(154)		(2,388)		61		(2,605)				(1,679)
(Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity
Beginning balance		(35,049)	(27,512)	(20,044)	[1]	(24,927)		(18,626)	(10,967)	(33,292)	[1]	(20,044)	[1]	(33,292)	[1]	(20,044)	[1]	(33,292)	[1]	(20,044)	[1]	(33,292)	[1]
Distributions - Common Stock		(3,554)	(3,220)	(3,221)		(3,190)		(3,190)	(2,970)	(2,897)										(13,636)		(12,247)	[1]
Restricted stock vesting	[1]																					0
Net income		3,272	(4,317)	(4,247)		8,073		(3,111)	(4,689)	25,222										856		25,495	[1]
Ending balance		(35,331)	(35,049)	(27,512)		(20,044)	[1]	(24,927)	(18,626)	(10,967)		(35,049)		(18,626)		(35,331)		(24,927)		(32,824)		(20,044)	[1]
(Accumulated Deficit) | As Previously Reported
Increase (Decrease) in Stockholders' Equity
Beginning balance		(35,049)	(27,512)	(20,044)		(24,927)		(18,626)	(10,967)	(33,292)		(20,044)		(33,292)		(20,044)		(33,292)		(20,044)		(33,292)
Distributions - Common Stock		(3,554)	(3,220)	(3,221)		(3,190)		(3,190)	(2,970)	(2,897)												(12,247)
Net income		3,272	(4,317)	(4,247)		8,073		(3,111)	(4,689)	25,222												25,495
Ending balance		(35,331)	(35,049)	(27,512)		(20,044)		(24,927)	(18,626)	(10,967)		(35,049)		(18,626)		(35,331)		(24,927)				(20,044)
(Accumulated Deficit) | Restatement Impact
Increase (Decrease) in Stockholders' Equity
Beginning balance		0	0	0		0		0	0	0		0		0		0		0		0		0
Distributions - Common Stock								0	0
Ending balance		0	0	0		0		0	0	0		0		0		0		0				0
Non Controlling Interests
Increase (Decrease) in Stockholders' Equity
Beginning balance		320	317	331	[1]	342		369	340	477	[1]	331	[1]	477	[1]	331	[1]	477	[1]	331	[1]	477	[1]
Contributions from non-controlling interests																						0
Distributions to non-controlling interests		(1,134)	(39)	(46)		(35)		(62)	(10)	(2)										(1,257)		(107)	[1]
Purchase of non-controlling interest										(168)												(171)	[1]
Net income		799	44	34		26		34	38	32										837		130	[1]
Other comprehensive income (loss)			(2)	(2)		(2)		1	1	1										(4)		2	[1]
Ending balance		(15)	320	317		331	[1]	342	369	340		320		369		(15)		342		(93)		331	[1]
Non Controlling Interests | As Previously Reported
Increase (Decrease) in Stockholders' Equity
Beginning balance		93,868	94,452	91,585		98,498		102,844	96,237	72,935		91,585		72,935		91,585		72,935		91,585		72,935
Contributions from non-controlling interests		1,237	3,027	264		1,435			9,930	18,088												41,824
Distributions to non-controlling interests		(3,510)	(2,264)	(2,345)		(15,070)		(1,525)	(2,163)	(32,020)												(50,777)
Purchase of non-controlling interest						(97)		(1,889)		(168)												(2,155)
Net income		73	(933)	(836)		7,237		(1,027)	(1,282)	24,686												29,614
Other comprehensive income (loss)		(104)	(414)	(263)		(418)		95	122	346												144
Ending balance		91,564	93,868	94,452		91,585		98,498	102,844	96,237		93,868		102,844		91,564		98,498				91,585
Non Controlling Interests | Restatement Impact
Increase (Decrease) in Stockholders' Equity
Beginning balance		(93,548)	(94,135)	(91,254)		(98,156)		(102,475)	(95,897)	(72,458)		(91,254)		(72,458)		(91,254)		(72,458)		$ (91,254)		(72,458)
Contributions from non-controlling interests		(1,237)	(3,027)	(264)		(1,435)			(9,930)	(18,088)												(41,824)
Distributions to non-controlling interests		2,376	2,225	2,299		15,035		1,463	2,153	32,018												50,670
Purchase of non-controlling interest						97		1,889														1,984
Net income		726	977	870		(7,211)		1,061	1,320	(24,654)												(29,484)
Other comprehensive income (loss)		104	412	261		416		(94)	(121)	(345)												(142)
Ending balance		$ (91,579)	$ (93,548)	$ (94,135)		$ (91,254)		$ (98,156)	$ (102,475)	$ (95,897)		$ (93,548)		$ (102,475)		$ (91,579)		$ (98,156)				$ (91,254)

[1] * Amounts restated See footnotes 2 and 16 for more information.