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Investments in Unconsolidated Affiliates (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
item
mi
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Investments in unconsolidated affiliates        
Balance at beginning of period $ 652,767 $ 696,009    
Additional investments 262      
Equity in earnings of unconsolidated affiliates 105,456 94,218 $ 90,451  
Distributions from unconsolidated affiliates (131,835) (120,460) (118,990)  
Return of investment in unconsolidated affiliate   (17,000)    
Balance at end of period 626,650 652,767 696,009  
Summarized Financial Information of Unconsolidated Affiliates        
Current assets 91,128 88,993    
Total assets 5,737,618 5,791,320    
Current liabilities 96,417 102,077    
Partners' capital 2,151,731 2,192,318 2,286,698 $ 2,418,286
Total liabilities and stockholders' equity 5,737,618 5,791,320    
Revenues 1,041,771 919,985 898,202  
Income from operations 611,862 539,466 555,327  
Net income attributable to unconsolidated affiliates, including noncontrolling interest 371,786 326,242 331,617  
Unconsolidated Affiliates        
Summarized Financial Information of Unconsolidated Affiliates        
Current assets 68,894 74,852    
Noncurrent assets 1,460,004 1,517,349    
Total assets 1,528,898 1,592,201    
Current liabilities 7,711 5,453    
Noncurrent liabilities 4,028 4,427    
Noncontrolling interest 146,094 154,100    
Partners' capital 1,371,065 1,428,221    
Total liabilities and stockholders' equity 1,528,898 1,592,201    
Revenues 388,717 357,730 333,565  
Operating expenses 156,678 153,383 130,080  
Income from operations 232,039 204,347 203,485  
Net income attributable to unconsolidated affiliates, including noncontrolling interest 269,471 248,458 236,444  
Net income attributable to unconsolidated affiliates $ 278,545 257,458 245,256  
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 $ 526,652 565,437    
Equity in earnings of unconsolidated affiliates 98,194 86,660    
Distributions from unconsolidated affiliates (116,025) (108,445)    
Return of investment in unconsolidated affiliate   (17,000)    
Balance at end of period $ 508,821 526,652 565,437  
Stonewall        
Equity Method Investments        
Ownership percentage 15.00%      
Number of miles of pipeline | mi 67      
Investments in unconsolidated affiliates        
Balance at beginning of period $ 126,115 130,572    
Additional investments 262      
Equity in earnings of unconsolidated affiliates 7,262 7,558    
Distributions from unconsolidated affiliates (15,810) (12,015)    
Balance at end of period $ 117,829 $ 126,115 $ 130,572