v3.8.0.1
SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:                      
Revenues $ 450,535 $ 440,566 $ 435,488 $ 487,430 $ 471,757 $ 441,418 $ 437,804 $ 405,703 $ 1,814,019 $ 1,756,682 $ 2,084,040
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 264,232 216,736 210,210
Operating income (loss):                      
Less general and administrative expenses                 112,240 98,817 102,521
Less other depreciation and amortization expense                 264,232 216,736 210,210
Total operating income (loss) $ 74,018 $ 91,717 $ 73,404 $ 97,139 $ 85,373 $ 87,954 $ 91,217 $ 94,565 336,278 359,109 390,704
Pipeline Segment | Third Party Revenue [Member]                      
Revenues:                      
Revenues                 516,288 485,650 508,522
Storage Segment                      
Revenues:                      
Revenues                 616,953 610,042 624,908
Storage Segment | Third Party Revenue [Member]                      
Revenues:                      
Revenues                 604,847 589,098 599,302
Storage Segment | Intersegment revenue [Member]                      
Revenues:                      
Revenues                 12,106 20,944 25,606
Fuels Marketing Segment | Third Party Revenue [Member]                      
Revenues:                      
Revenues                 692,884 681,934 976,216
Operating Segments [Member]                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 255,534 208,217 201,719
Operating income (loss):                      
Less other depreciation and amortization expense                 255,534 208,217 201,719
Total operating income (loss)                 457,216 466,445 501,716
Operating Segments [Member] | Pipeline Segment                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 128,061 89,554 84,951
Operating income (loss):                      
Less other depreciation and amortization expense                 128,061 89,554 84,951
Total operating income (loss)                 231,795 248,238 270,349
Operating Segments [Member] | Storage Segment                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 127,473 118,663 116,768
Operating income (loss):                      
Less other depreciation and amortization expense                 127,473 118,663 116,768
Total operating income (loss)                 219,439 214,801 217,818
Operating Segments [Member] | Fuels Marketing Segment                      
Operating income (loss):                      
Total operating income (loss)                 5,983 3,406 13,507
Intersegment Eliminations [Member]                      
Revenues:                      
Revenues                 (12,106) (20,944) (25,606)
Operating income (loss):                      
Total operating income (loss)                 (1) 0 42
Corporate, Non-Segment [Member]                      
Depreciation, Depletion and Amortization [Abstract]                      
Depreciation and amortization expense                 8,698 8,519 8,491
Operating income (loss):                      
Less general and administrative expenses                 112,240 98,817 102,521
Less other depreciation and amortization expense                 $ 8,698 $ 8,519 $ 8,491