CONSOLIDATED AND CONDENSED STATEMENTS OF CAPITAL (DEFICIT) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Partners' Capital
Beginning balance			$ (46,871)	$ (36,196)
Net loss	$ (6,911)	$ (10,819)	(11,012)	(4,207)
Cash distributions			(593)	(5,121)
Unit-based compensation			336	1,070
Changes in fair values of commodity cash flow hedges	(5,999)	0	(5,999)	0
Purchase of treasury units			(17)	(9)
Ending balance	(64,156)	(44,463)	(64,156)	(44,463)
Common Limited | Common
Increase (Decrease) in Partners' Capital
Beginning balance			$ (48,776)	$ (38,342)
Beginning balance (in shares)			38,851,174	38,863,389
Net loss			$ (10,792)	$ (4,123)
Issuance of restricted units (in shares)			42,168	81,000
Forfeiture of restricted units (in shares)			(83,436)	(84,134)
Cash distributions			$ (581)	$ (5,019)
Unit-based compensation			336	1,070
Purchase of treasury units			$ (17)	$ (9)
Purchase of treasury units (in shares)			(7,156)	(7,748)
Ending balance	$ (59,830)	$ (46,423)	$ (59,830)	$ (46,423)
Ending balance (in shares)	38,802,750	38,852,507	38,802,750	38,852,507
General Partner Amount
Increase (Decrease) in Partners' Capital
Beginning balance			$ 1,905	$ 2,146
Net loss			(220)	(84)
Cash distributions			(12)	(102)
Ending balance	$ 1,673	$ 1,960	1,673	1,960
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital
Beginning balance			0	0
Changes in fair values of commodity cash flow hedges			(5,999)
Ending balance	$ (5,999)	$ 0	$ (5,999)	$ 0