Investments in Unconsolidated Affiliates (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) item mi	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Investments in unconsolidated affiliates
Balance at beginning of period	$ 626,650	$ 652,767
Additional investments	2,393	262
Equity in earnings of unconsolidated affiliates	110,573	105,456	$ 94,218
Distributions from unconsolidated affiliates	135,660	131,835	120,460
Return of investment in unconsolidated affiliate			(17,000)
Balance at end of period	603,956	626,650	652,767
Summarized Financial Information of Unconsolidated Affiliates
Current assets	118,064	91,128
Total assets	5,761,748	5,737,618
Current liabilities	100,612	96,417
Partners' capital	2,115,171	2,151,731	2,192,318	$ 2,286,698
Total liabilities and stockholders' equity	5,761,748	5,737,618
Revenues	1,106,193	1,041,771	919,985
Operating income	659,166	611,862	539,466
Net income attributable to unconsolidated affiliates, including noncontrolling interest	400,892	371,786	326,242
Unconsolidated Affiliates
Summarized Financial Information of Unconsolidated Affiliates
Current assets	79,680	68,894
Noncurrent assets	1,412,844	1,460,004
Total assets	1,492,524	1,528,898
Current liabilities	9,319	7,711
Noncurrent liabilities	3,630	4,028
Noncontrolling interest	139,368	146,094
Partners' capital	1,340,207	1,371,065
Total liabilities and stockholders' equity	1,492,524	1,528,898
Revenues	407,553	388,717	357,730
Operating expenses	163,134	156,678	153,383
Operating income	244,419	232,039	204,347
Net income attributable to unconsolidated affiliates, including noncontrolling interest	284,190	269,471	248,458
Net income attributable to unconsolidated affiliates	$ 293,252	278,545	257,458
Joint Venture
Equity Method Investments
Ownership percentage	50.00%
Percentage of interest held by joint venture in third party fractionator in Ohio	33.33%
Number of fractionators | item	2
Investments in unconsolidated affiliates
Balance at beginning of period	$ 508,821	526,652
Equity in earnings of unconsolidated affiliates	102,474	98,194
Distributions from unconsolidated affiliates	120,930	116,025
Balance at end of period	$ 490,365	508,821	526,652
Stonewall
Equity Method Investments
Ownership percentage	15.00%
Number of miles of pipeline | mi	67
Investments in unconsolidated affiliates
Balance at beginning of period	$ 117,829	126,115
Additional investments	2,393	262
Equity in earnings of unconsolidated affiliates	8,099	7,262
Distributions from unconsolidated affiliates	14,730	15,810
Balance at end of period	$ 113,591	$ 117,829	$ 126,115