Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Long-term Purchase Commitment [Line Items]

Summary Of Purchase And Sale Commitments

We account for derivatives at fair value with the exception of commitments that have been designated as normal purchases and sales for which we do not record assets or liabilities related to these agreements until the product is purchased or sold. At September 30, 2018, such commitments included the following (in thousands):

	Volume (Barrels)	Value
Fixed price purchases	1,469	$	102,956
Fixed price sales	1,469	$	102,801
Floating price purchases	8,506	$	632,046
Floating price sales	12,225	$	728,646

Long-term Purchase Commitment [Table Text Block]

The approximate amount of future obligation is as follows (in thousands):

For year ending:
December 31, 2018	$	2,720
December 31, 2019	9,783
December 31, 2020	9,063
December 31, 2021	7,337
December 31, 2022	6,905
Thereafter	2,854
Total expected future payments	$	38,662

Recorded Unconditional Purchase Obligations [Table Text Block]

The approximate amount of future obligations is as follows (in thousands):

For year ending:
December 31, 2018	$	5,449
December 31, 2019	21,865
December 31, 2020	19,751
December 31, 2021	12,976
December 31, 2022	13,231
Thereafter	20,312
Total expected future payments	$	93,584