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SEGMENT INFORMATION Table 5 - Capital Expenditures by Reportable Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Information      
Capital expenditures $ 1,846,357 $ 300,015 $ 470,872
Pipeline Segment      
Segment Information      
Capital expenditures 1,596,311 88,373 175,657
Storage Segment      
Segment Information      
Capital expenditures 244,398 206,641 285,258
Other partnership assets      
Segment Information      
Capital expenditures $ 5,648 $ 5,001 $ 9,957