CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' EQUITY - USD ($) $ in Thousands	Limited Partner Interest Series A Preferred Limited Partners	Limited Partner Interest Common Limited Partners	General Partner, Global GP LLC	Accumulated Other Comprehensive Loss	Noncontrolling Interest	Total
Balance, beginning of period at Dec. 31, 2018	$ 67,226	$ 437,874	$ (2,509)	$ (5,260)	$ 1,863	$ 499,194
Increase (Decrease) in Partners' Capital
Net income (loss)	1,682	5,140	304		(332)	6,794
Distributions to limited partners and general partner	(1,682)	(16,998)	(317)			(18,997)
Unit-based compensation		795				795
Other comprehensive income				1,744		1,744
LTIP units withheld for tax obligations		(8)				(8)
Balance, end of period at Mar. 31, 2019	67,226	426,803	(2,522)	(3,516)	1,531	489,522
Balance, beginning of period at Dec. 31, 2018	67,226	437,874	(2,509)	(5,260)	1,863	499,194
Increase (Decrease) in Partners' Capital
Net income (loss)						21,165
Other comprehensive income						2,480
Balance, end of period at Jun. 30, 2019	67,226	422,677	(2,529)	(2,780)	1,413	486,007
Balance, beginning of period at Mar. 31, 2019	67,226	426,803	(2,522)	(3,516)	1,531	489,522
Increase (Decrease) in Partners' Capital
Net income (loss)	1,682	12,441	366		(118)	14,371
Distributions to limited partners and general partner	(1,682)	(17,338)	(373)			(19,393)
Unit-based compensation		795				795
Other comprehensive income				736		736
LTIP units withheld for tax obligations		(24)				(24)
Balance, end of period at Jun. 30, 2019	67,226	422,677	(2,529)	(2,780)	1,413	486,007
Balance, beginning of period at Dec. 31, 2019	67,226	398,535	(2,620)	(5,076)	1,174	459,239
Increase (Decrease) in Partners' Capital
Net income (loss)	1,682	1,572	22		(201)	3,075
Noncontrolling interest capital contribution					400	400
Distributions to limited partners and general partner	(1,682)	(17,848)	(443)			(19,973)
Unit-based compensation		288				288
Other comprehensive income				(2,980)		(2,980)
LTIP units withheld for tax obligations		(25)				(25)
Dividends on repurchased units		68				68
Balance, end of period at Mar. 31, 2020	67,226	382,590	(3,041)	(8,056)	1,373	440,092
Balance, beginning of period at Dec. 31, 2019	67,226	398,535	(2,620)	(5,076)	1,174	459,239
Increase (Decrease) in Partners' Capital
Net income (loss)						79,048
Other comprehensive income						4,567
Repurchase of common units						(300)
Balance, end of period at Jun. 30, 2020	67,226	443,326	(2,621)	(509)	1,084	508,506
Balance, beginning of period at Mar. 31, 2020	67,226	382,590	(3,041)	(8,056)	1,373	440,092
Increase (Decrease) in Partners' Capital
Net income (loss)	1,682	74,069	511		(289)	75,973
Distributions to limited partners and general partner	(1,682)	(13,385)	(91)			(15,158)
Unit-based compensation		299				299
Other comprehensive income				7,547		7,547
Repurchase of common units		(291)				(291)
LTIP units withheld for tax obligations		(5)				(5)
Dividends on repurchased units		49				49
Balance, end of period at Jun. 30, 2020	$ 67,226	$ 443,326	$ (2,621)	$ (509)	$ 1,084	$ 508,506