CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($) $ in Thousands	Limited Partners' Capital	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest	Total
Balance at beginning of period at Dec. 31, 2019	$ 1,331,482	$ (77,993)	$ 11,935	$ 1,265,424
Balance at beginning of period (in units) at Dec. 31, 2019	126,915,597
Comprehensive income (loss):
Net income (loss)	$ (129,220)		169	(129,051)
Actuarially determined long-term liability adjustments		(9,681)		(9,681)
COMPREHENSIVE INCOME (LOSS)				(138,732)
Settlement of deferred compensation plans	$ (3,800)			(3,800)
Settlement of deferred compensation plans (in units)	279,622
Common unit-based compensation	$ 3,345			3,345
Distributions on deferred common unit-based compensation	(986)			(986)
Distributions from consolidated company to noncontrolling interest			(728)	(728)
Distributions to Partners	(50,767)			(50,767)
Other	(1,489)			(1,489)
Balance at end of period at Dec. 31, 2020	$ 1,148,565	(87,674)	11,376	1,072,267
Balance at end of period (in units) at Dec. 31, 2020	127,195,219
Comprehensive income (loss):
Net income (loss)	$ 178,157		598	178,755
Actuarially determined long-term liability adjustments		23,445		23,445
COMPREHENSIVE INCOME (LOSS)				202,200
Settlement of deferred compensation plans	(1,090)			(1,090)
Common unit-based compensation	5,709			5,709
Distributions on deferred common unit-based compensation	(1,280)			(1,280)
Distributions from consolidated company to noncontrolling interest			(859)	(859)
Distributions to Partners	(50,878)			(50,878)
Balance at end of period at Dec. 31, 2021	$ 1,279,183	(64,229)	11,115	$ 1,226,069
Balance at end of period (in units) at Dec. 31, 2021	127,195,219			127,195,219
Comprehensive income (loss):
Net income (loss)	$ 577,190		1,958	$ 579,148
Actuarially determined long-term liability adjustments		23,175		23,175
COMPREHENSIVE INCOME (LOSS)				602,323
Common unit-based compensation	11,029			11,029
Distributions on deferred common unit-based compensation	(5,553)			(5,553)
Distributions from consolidated company to noncontrolling interest			(1,596)	(1,596)
Profits interest adjustment for noncontrolling interest	(15,030)		15,030
Distributions to Partners	(190,794)			(190,794)
Balance at end of period at Dec. 31, 2022	$ 1,656,025	$ (41,054)	$ 26,507	$ 1,641,478
Balance at end of period (in units) at Dec. 31, 2022	127,195,219			127,195,219