Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 176,068	$ 14,701
Trade accounts receivable	138,779	105,689
Other accounts receivable	14,561	25,761
Inventory	182,345	134,378
Energy commodity derivatives deposits	36,690	49,899
Other current assets	63,396	39,966
Total current assets	611,839	370,394
Property, plant and equipment	7,235,468	6,783,737
Less: accumulated depreciation	1,682,633	1,507,996
Net property, plant and equipment	5,552,835	5,275,741
Investments in non-controlled entities	1,082,511	931,255
Long-term receivables	27,676	23,870
Goodwill	53,260	53,260
Other intangibles (less accumulated amortization of $2,136 and $1,389 at December 31, 2016 and 2017, respectively)	52,764	51,976
Other noncurrent assets	13,490	65,577
Total assets	7,394,375	6,772,073
Current liabilities:
Accounts payable	104,852	77,248
Accrued payroll and benefits	56,261	45,690
Accrued interest payable	70,657	65,643
Accrued taxes other than income	51,343	50,166
Environmental liabilities	6,235	10,249
Deferred revenue	117,795	101,891
Accrued product purchases	96,159	51,600
Energy commodity derivatives contracts, net	25,694	30,738
Current portion of long-term debt, net	250,974	0
Other current liabilities	56,540	48,431
Total current liabilities	836,510	481,656
Long-term debt	4,273,518	4,087,192
Long-term pension and benefits	111,305	71,461
Other noncurrent liabilities	30,350	25,868
Environmental liabilities	13,039	13,791
Commitments and contingencies
Partners' capital:
Limited partner unitholders (227,784 units and 228,025 units outstanding at December 31, 2016 and 2017, respectively)	2,267,231	2,193,346
Accumulated other comprehensive loss	(137,578)	(101,241)
Total partners’ capital	2,129,653	2,092,105
Total liabilities and partners' capital	$ 7,394,375	$ 6,772,073