Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Class A Convertible Preferred Units [Member]	Class B Convertible Preferred Units [Member]	General Partner [Member]	Limited Partners [Member]	Limited Partners [Member] Class A Convertible Preferred Units [Member]	Limited Partners [Member] Class B Convertible Preferred Units [Member]
Balance at Dec. 31, 2018	$ 60,409			$ (786)	$ 61,195
Balance, Units at Dec. 31, 2018					1,522
Increase (Decrease) in Partners' Capital [Roll Forward]
Equity-based compensation	334				$ 334
Equity-based compensation, Units					19
Distributions to convertible preferred units		$ (500)	$ (300)			$ (500)	$ (300)
Accretion of beneficial conversion feature of convertible preferred units		(301)	(48)			(301)	(48)
Net Income (loss)	(3,788)			(45)	$ (3,743)
Balance at Mar. 31, 2019	55,806			(831)	$ 56,637
Balance, Units at Mar. 31, 2019					1,541
Balance at Dec. 31, 2018	60,409			(786)	$ 61,195
Balance, Units at Dec. 31, 2018					1,522
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income (loss)	1,309
Balance at Jun. 30, 2019	59,868			(771)	$ 60,639
Balance, Units at Jun. 30, 2019					1,541
Balance at Mar. 31, 2019	55,806			(831)	$ 56,637
Balance, Units at Mar. 31, 2019					1,541
Increase (Decrease) in Partners' Capital [Roll Forward]
Equity-based compensation	122				$ 122
Distributions to convertible preferred units		(500)	(300)			(500)	(300)
Accretion of beneficial conversion feature of convertible preferred units		(309)	(48)			(309)	(48)
Net Income (loss)	5,097			60	5,037
Balance at Jun. 30, 2019	59,868			(771)	$ 60,639
Balance, Units at Jun. 30, 2019					1,541
Balance at Dec. 31, 2019	55,863			(793)	$ 56,656
Balance, Units at Dec. 31, 2019					1,541
Increase (Decrease) in Partners' Capital [Roll Forward]
Equity-based compensation	78				$ 78
Equity-based compensation, Units					17
Distributions to convertible preferred units		(500)	(300)			(500)	(300)
Accretion of beneficial conversion feature of convertible preferred units		(323)	(49)			(323)	(49)
Net Income (loss)	2,783			31	$ 2,752
Balance at Mar. 31, 2020	57,552			(762)	$ 58,314
Balance, Units at Mar. 31, 2020					1,558
Balance at Dec. 31, 2019	55,863			(793)	$ 56,656
Balance, Units at Dec. 31, 2019					1,541
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income (loss)	(9,142)
Balance at Jun. 30, 2020	81,744				$ 81,744
Balance, Units at Jun. 30, 2020					14,312
Balance at Mar. 31, 2020	57,552			(762)	$ 58,314
Balance, Units at Mar. 31, 2020					1,558
Increase (Decrease) in Partners' Capital [Roll Forward]
Equity-based compensation	193				$ 193
Equity-based compensation, Units					11
Distributions to convertible preferred units		(333)	(200)			(333)	(200)
Accretion of beneficial conversion feature of convertible preferred units		$ (219)	$ (32)			$ (219)	$ (32)
Conversion of Preferred Units Class A and Class B to common units	36,708				$ 36,708
Conversion of General Partner to common units				$ 762	(762)
Net Income (loss)	(11,925)				$ (11,925)
Conversion of Preferred Units Class A and Class B to common units, Shares					12,725
Conversion of General Partner to common units, Shares					18
Balance at Jun. 30, 2020	$ 81,744				$ 81,744
Balance, Units at Jun. 30, 2020					14,312