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Consolidated Statements Of Cash Flows - Supplemental Disclosures (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Consolidated Statement Of Cash Flows
Changes in the components of operating assets and liabilities are as follows (in thousands):
 
 
 
Year Ended December 31,
 
 
2015
 
2016
 
2017
Trade accounts receivable and other accounts receivable
 
$
3,664

 
$
(31,107
)
 
$
(25,639
)
Inventory
 
26,894

 
(3,510
)
 
(47,967
)
Energy commodity derivatives contracts, net of derivatives deposits
 
(606
)
 
(692
)
 
8,556

Accounts payable
 
4,107

 
(4,423
)
 
8,954

Accrued payroll and benefits
 
3,466

 
(6,074
)
 
10,596

Accrued interest payable
 
5,323

 
14,347

 
5,014

Accrued taxes other than income
 
3,699

 
(1,421
)
 
1,177

Deferred revenue
 
10,485

 
20,264

 
15,904

Accrued product liabilities
 
(13,016
)
 
20,261

 
44,559

Current and noncurrent environmental liabilities
 
(4,904
)
 
(7,398
)
 
(4,766
)
Other current and noncurrent assets and liabilities
 
9,250

 
(21,762
)
 
(693
)
Total
 
$
48,362

 
$
(21,515
)
 
$
15,695