v3.10.0.1
STATEMENTS OF CASH FLOWS (Tables)
 6 Months Ended
Jun. 30, 2018
Statement of Cash Flows [Abstract]  
Schedule of Changes in Current Assets and Liabilities [Text Block]
Changes in current assets and current liabilities were as follows:
 
Six Months Ended June 30,
 
2018
 
2017
 
(Thousands of Dollars)
Decrease (increase) in current assets:
 
 
 
Accounts receivable
$
34,518

 
$
48,875

Receivable from related party
130

 
231

Inventories
(1,233
)
 
13,005

Other current assets
(2,494
)
 
(2,388
)
Increase (decrease) in current liabilities:
 
 
 
Accounts payable
5,149

 
(57,822
)
Accrued interest payable
(4,325
)
 
6,234

Accrued liabilities
10,476

 
(14,703
)
Taxes other than income tax
1,329

 
(3,094
)
Income tax payable
(817
)
 
(5,682
)
Changes in current assets and current liabilities
$
42,733

 
$
(15,344
)
Schedule of Supplemental Cash Flow Information [Text Block]
Cash flows related to interest and income taxes were as follows:
 
Six Months Ended June 30,
 
2018
 
2017
 
(Thousands of Dollars)
Cash paid for interest, net of amount capitalized
$
96,761

 
$
70,119

Cash paid for income taxes, net of tax refunds received
$
7,973

 
$
9,556