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Partners' Capital - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,812,490 $ 1,831,460 $ 1,853,533 $ 1,934,118 $ 1,921,404 $ 1,858,597 $ 1,853,533 $ 1,858,597
Balance at beginning of period (in units)     128,061,981       128,061,981  
Comprehensive income (loss):                
Net income 96,818 61,025 $ 75,560 86,916 101,509 159,567 $ 233,403 347,992
Other comprehensive income (400) 11,194 270 1,022 957 923 11,064 2,902
Comprehensive Income 96,418 72,219 75,830 87,938 102,466 160,490 244,467 350,894
Settlement of deferred compensation plans     (7,082) (2,252)   (13,292)    
Common unit-based compensation 2,297 2,281 1,964 3,032 2,926 2,604    
Distributions on deferred common unit-based compensation (718) (841) (1,247) (1,082) (1,091) (2,261)    
Distributions from consolidated company to noncontrolling interest (2,372) (2,731) (1,894) (1,883) (1,942) (1,981)    
Other       (5,118)        
Distributions to Partners (77,058) (89,898) (89,644) (89,643) (89,645) (88,985)    
Balance at end of period $ 1,831,057 1,812,490 1,831,460 1,925,110 1,934,118 1,921,404 $ 1,831,057 1,925,110
Balance at end of period (in units) 128,428,024           128,428,024  
Cumulative Effect, Period of Adoption, Adjustment                
Increase (decrease) in Partners' Capital                
Balance at beginning of period         6,232      
Comprehensive income (loss):                
Balance at end of period           6,232    
Accumulated Other Comprehensive Income (Loss)                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ (23,639) (34,833) (35,103) (59,645) (60,602) (61,525) $ (35,103) (61,525)
Comprehensive income (loss):                
Net income       0 0 0    
Other comprehensive income (400) 11,194 270 1,022 957 923    
Settlement of deferred compensation plans       0   0    
Common unit-based compensation       0 0 0    
Distributions on deferred common unit-based compensation       0 0 0    
Distributions from consolidated company to noncontrolling interest       0 0 0    
Other       0        
Distributions to Partners       0 0 0    
Balance at end of period (24,039) (23,639) (34,833) (58,623) (59,645) (60,602) (24,039) (58,623)
Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment                
Increase (decrease) in Partners' Capital                
Balance at beginning of period         0      
Comprehensive income (loss):                
Balance at end of period           0    
Noncontrolling Interest                
Increase (decrease) in Partners' Capital                
Balance at beginning of period 19,353 20,469 20,786 23,004 23,624 24,095 20,786 24,095
Comprehensive income (loss):                
Net income 1,714 1,615 1,577 635 1,322 1,510    
Other comprehensive income       0 0 0    
Settlement of deferred compensation plans       0   0    
Common unit-based compensation       0 0 0    
Distributions on deferred common unit-based compensation       0 0 0    
Distributions from consolidated company to noncontrolling interest (2,372) (2,731) (1,894) (1,883) (1,942) (1,981)    
Other       0        
Distributions to Partners       0 0 0    
Balance at end of period 18,695 19,353 20,469 21,756 23,004 23,624 18,695 21,756
Noncontrolling Interest | Cumulative Effect, Period of Adoption, Adjustment                
Increase (decrease) in Partners' Capital                
Balance at beginning of period         0      
Comprehensive income (loss):                
Balance at end of period           0    
Limited Partners' Capital                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,816,776 $ 1,845,824 $ 1,867,850 $ 1,970,759 $ 1,958,382 $ 1,896,027 $ 1,867,850 $ 1,896,027
Balance at beginning of period (in units) 128,428,024 128,428,024 128,061,981 128,061,981 128,061,981 127,125,437 128,061,981 127,125,437
Comprehensive income (loss):                
Net income $ 95,104 $ 59,410 $ 73,983 $ 86,281 $ 100,187 $ 158,057    
Other comprehensive income       0 0 0    
Settlement of deferred compensation plans     $ (7,082) (2,252)   $ (13,292)    
Settlement of deferred common unit- based compensation plans (in units)     366,043     936,544    
Common unit-based compensation 2,297 2,281 $ 1,964 3,032 2,926 $ 2,604    
Distributions on deferred common unit-based compensation (718) (841) (1,247) (1,082) (1,091) (2,261)    
Distributions from consolidated company to noncontrolling interest       0 0 0    
Other       (5,118)        
Distributions to Partners (77,058) (89,898) (89,644) (89,643) (89,645) (88,985)    
Balance at end of period $ 1,836,401 $ 1,816,776 $ 1,845,824 $ 1,961,977 $ 1,970,759 $ 1,958,382 $ 1,836,401 $ 1,961,977
Balance at end of period (in units) 128,428,024 128,428,024 128,428,024 128,061,981 128,061,981 128,061,981 128,428,024 128,061,981
Limited Partners' Capital | Cumulative Effect, Period of Adoption, Adjustment                
Increase (decrease) in Partners' Capital                
Balance at beginning of period         $ 6,232      
Comprehensive income (loss):                
Balance at end of period           $ 6,232