v3.20.4
SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:      
Revenues $ 1,481,564 $ 1,498,021 $ 1,520,262
Depreciation, Depletion and Amortization [Abstract]      
Other depreciation and amortization expense 8,625 8,360 8,604
Total depreciation and amortization expense 285,101 272,924 255,892
Operating income (loss):      
General and administrative expenses 102,716 107,855 100,067
Other depreciation and amortization expense 8,625 8,360 8,604
Operating income (loss) 209,102 390,916 335,728
Pipeline Segment      
Revenues:      
Revenues 718,823 701,830 611,065
Storage Segment      
Revenues:      
Revenues 494,442 454,001 443,588
Storage Segment | Third Party Revenue [Member]      
Revenues:      
Revenues 494,396 453,976 443,546
Storage Segment | Intersegment revenue [Member]      
Revenues:      
Revenues 46 25 42
Fuels Marketing Segment      
Revenues:      
Revenues 268,345 342,215 465,651
Operating Segments [Member]      
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization expense 276,476 264,564 247,288
Operating income (loss):      
Operating income (loss) 320,443 507,131 444,399
Operating Segments [Member] | Pipeline Segment      
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization expense 177,384 166,991 153,943
Operating income (loss):      
Operating income (loss) 118,429 332,480 272,695
Operating Segments [Member] | Storage Segment      
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization expense 99,092 97,573 93,345
Operating income (loss):      
Operating income (loss) 189,781 154,105 155,708
Operating Segments [Member] | Fuels Marketing Segment      
Operating income (loss):      
Operating income (loss) 12,233 20,578 15,964
Intersegment Eliminations [Member]      
Revenues:      
Revenues (46) (25) (42)
Operating income (loss):      
Operating income (loss) 0 (32) 32
Corporate, Non-Segment [Member]      
Depreciation, Depletion and Amortization [Abstract]      
Other depreciation and amortization expense 8,625 8,360 8,604
Operating income (loss):      
General and administrative expenses 102,716 107,855 100,067
Other depreciation and amortization expense $ 8,625 $ 8,360 $ 8,604