Supplemental Cash Flow Information - Operating assets and liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Components of operating assets and liabilities
Decrease (increase) in restricted cash	$ 6,798	$ (2,188)
Decrease (increase) in accounts receivable	8,179	(95,642)
Decrease (increase) in receivable from affiliates	8,986	29,094
Decrease (increase) in inventories	(23,256)	(18,676)
Decrease (increase) in derivatives and margin deposits	3,159	(2,200)
Decrease (increase) in other current assets	(1,807)	(1,690)
Decrease (increase) in other assets	1,818	(221)
Increase (decrease) in accounts payable and accrued liabilities	1,259	81,835
Increase (decrease) in payable to affiliates	(2,310)	(31,781)
Increase (decrease) in payables to pre-petition creditors	(3,836)	(47)
Increase (decrease) in other noncurrent liabilities	(1,336)	1,585
Total changes in operating assets and liabilities	$ (2,346)	$ (39,931)