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Reportable Segments (Financial Data) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reportable Segments                      
Revenues $ 142,895 $ 122,805 $ 130,769 $ 97,491 $ 153,205 $ 154,641 $ 199,448 $ 173,291 $ 493,960 $ 680,585 $ 726,154
Cost of sales, excluding depreciation and amortization                 350,187 527,476 605,682
Operating expense                 64,137 69,377 65,584
Depreciation and amortization                 47,151 46,852 40,230
Adjusted EBITDA                 65,458 64,882 51,573
Capital expenditures                 24,718 71,011 56,878
Crude oil pipelines and storage                      
Reportable Segments                      
Revenues                 322,140 480,527 495,971
Adjusted EBITDA                 26,405 23,119 25,339
Refined products terminals and storage                      
Reportable Segments                      
Revenues                 28,168 23,227 23,287
Adjusted EBITDA                 13,317 10,867 10,723
NGL distribution and sales                      
Reportable Segments                      
Revenues                 143,652 176,831 206,896
Adjusted EBITDA                 25,736 30,896 15,511
Operating segment | Crude oil pipelines and storage                      
Reportable Segments                      
Cost of sales, excluding depreciation and amortization                 284,747 445,027 459,183
Operating expense                 8,195 9,238 7,928
Depreciation and amortization                 20,799 20,356 17,240
Capital expenditures                 8,192 42,919 36,691
Operating segment | Refined products terminals and storage                      
Reportable Segments                      
Cost of sales, excluding depreciation and amortization                 11,760 8,649 6,453
Operating expense                 2,428 2,980 4,602
Depreciation and amortization                 6,664 6,830 5,911
Capital expenditures                 6,028 8,002 2,489
Operating segment | NGL distribution and sales                      
Reportable Segments                      
Cost of sales, excluding depreciation and amortization                 54,704 76,618 126,686
Operating expense                 53,278 57,200 52,109
Depreciation and amortization                 17,986 18,628 16,163
Capital expenditures                 6,553 18,587 16,557
Amounts not included in segment Adjusted EBITDA                      
Reportable Segments                      
Cost of sales, excluding depreciation and amortization                 (1,024) (2,818) 13,360
Operating expense                 236 (41) 945
Corporate and other                      
Reportable Segments                      
Depreciation and amortization                 1,702 1,038 916
Capital expenditures                 $ 3,945 $ 1,503 $ 1,141