v3.19.3.a.u2
SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:                      
Revenues $ 399,694 $ 378,056 $ 372,445 $ 347,826 $ 374,137 $ 380,142 $ 389,256 $ 376,727 $ 1,498,021 $ 1,520,262 $ 1,444,772
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 272,924 255,892 228,192
Operating income (loss):                      
Less general and administrative expenses                 107,855 100,067 107,556
Less other depreciation and amortization expense                 272,924 255,892 228,192
Total operating income (loss) $ 124,056 $ 99,972 $ 93,283 $ 73,605 $ 86,683 $ 89,165 $ 76,387 $ 83,493 390,916 335,728 290,510
Pipeline Segment                      
Revenues:                      
Revenues                 701,830 611,065 516,288
Pipeline Segment | Third Party Revenue [Member]                      
Revenues:                      
Revenues                 701,830 611,065 516,288
Storage Segment                      
Revenues:                      
Revenues                 454,001 443,588 443,016
Storage Segment | Third Party Revenue [Member]                      
Revenues:                      
Revenues                 453,976 443,546 438,677
Storage Segment | Intersegment revenue [Member]                      
Revenues:                      
Revenues                 25 42 4,339
Fuels Marketing Segment | Third Party Revenue [Member]                      
Revenues:                      
Revenues                 342,215 465,651 489,807
Operating Segments [Member]                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 264,564 247,288 219,757
Operating income (loss):                      
Less other depreciation and amortization expense                 264,564 247,288 219,757
Total operating income (loss)                 507,131 444,399 406,501
Operating Segments [Member] | Pipeline Segment                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 166,991 153,943 128,061
Operating income (loss):                      
Less other depreciation and amortization expense                 166,991 153,943 128,061
Total operating income (loss)                 332,480 272,695 231,795
Operating Segments [Member] | Storage Segment                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 97,573 93,345 91,696
Operating income (loss):                      
Less other depreciation and amortization expense                 97,573 93,345 91,696
Total operating income (loss)                 154,105 155,708 172,720
Operating Segments [Member] | Fuels Marketing Segment                      
Operating income (loss):                      
Total operating income (loss)                 20,578 15,964 1,987
Intersegment Eliminations [Member]                      
Revenues:                      
Revenues                 (25) (42) (4,339)
Operating income (loss):                      
Total operating income (loss)                 (32) 32 (1)
Corporate, Non-Segment [Member]                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 8,360 8,604 8,435
Operating income (loss):                      
Less general and administrative expenses                 107,855 100,067 107,556
Less other depreciation and amortization expense                 $ 8,360 $ 8,604 $ 8,435