Investments in Unconsolidated Affiliates (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) item mi	Mar. 31, 2021 USD ($)
Investments in unconsolidated affiliates
Balance at beginning of period	$ 696,009
Additional investments		$ 757
Equity in earnings of unconsolidated affiliates	23,232	20,744
Distributions from unconsolidated affiliates	(31,130)	$ (31,910)
Balance at end of period	$ 688,111
Stonewall
Equity Method Investments
Ownership percentage	15.00%
Number of miles of pipeline | mi	67
Investments in unconsolidated affiliates
Balance at beginning of period	$ 130,572
Equity in earnings of unconsolidated affiliates	1,311
Distributions from unconsolidated affiliates	(3,000)
Balance at end of period	$ 128,883
MarkWest 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	$ 565,437
Equity in earnings of unconsolidated affiliates	21,921
Distributions from unconsolidated affiliates	(28,130)
Balance at end of period	$ 559,228