PARTNERS' CAPITAL - Change (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Increase (decrease) in Partners' Capital
Balance at beginning of period	$ 1,858,597	$ 1,708,026
Balance at beginning of period (in units)	127,125,437
Comprehensive income (loss):
Net income	$ 159,567	192,678
Actuarially determined long-term liability adjustments	923	565
COMPREHENSIVE INCOME	160,490	193,243
Settlement of deferred compensation plans	(13,292)	(9,320)
Purchase of units under unit repurchase program		(18,209)
Common unit-based compensation	2,604	2,830
Distributions on deferred common unit-based compensation	(2,261)	(2,901)
Distributions from consolidated company to noncontrolling interest	(1,981)	(2,288)
JC Resources acquisition		(72,250)
Cash retained by JC Resources in acquisition		(2,933)
Distributions to Partners	(88,985)	(89,037)
Balance at end of period	$ 1,921,404	1,707,161
Balance at end of period (in units)	128,061,981
Cumulative Effect, Period of Adoption, Adjustment
Increase (decrease) in Partners' Capital
Balance at beginning of period	$ 6,232
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in Partners' Capital
Balance at beginning of period	(61,525)	(41,054)
Comprehensive income (loss):
Actuarially determined long-term liability adjustments	923	565
Balance at end of period	(60,602)	(40,489)
Noncontrolling Interest
Increase (decrease) in Partners' Capital
Balance at beginning of period	24,095	26,507
Comprehensive income (loss):
Net income	1,510	1,493
Distributions from consolidated company to noncontrolling interest	(1,981)	(2,288)
Balance at end of period	23,624	25,712
Limited Partners' Capital
Increase (decrease) in Partners' Capital
Balance at beginning of period	$ 1,896,027	$ 1,656,025
Balance at beginning of period (in units)	127,125,437	127,195,219
Comprehensive income (loss):
Net income	$ 158,057	$ 189,801
Settlement of deferred compensation plans	$ (13,292)	$ (9,320)
Settlement of deferred common unit- based compensation plans (in units)	936,544	860,060
Purchase of units under unit repurchase program		$ (18,209)
Purchase of units under unit repurchase program (in units)		(860,060)
Common unit-based compensation	$ 2,604	$ 2,830
Distributions on deferred common unit-based compensation	(2,261)	(2,901)
JC Resources acquisition		(7,251)
Distributions to Partners	(88,985)	(89,037)
Balance at end of period	$ 1,958,382	$ 1,721,938
Balance at end of period (in units)	128,061,981	127,195,219
Limited Partners' Capital | Cumulative Effect, Period of Adoption, Adjustment
Increase (decrease) in Partners' Capital
Balance at beginning of period	$ 6,232
General Partners' Capital
Increase (decrease) in Partners' Capital
Balance at beginning of period		$ 66,548
Comprehensive income (loss):
Net income		1,384
JC Resources acquisition		(64,999)
Cash retained by JC Resources in acquisition		$ (2,933)