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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2018
Supplemental Cash Flow Information [Abstract]  
Supplemental cash flow disclosures
In order to determine net cash provided by operating activities, net income is adjusted by, among other things, changes in current assets and current liabilities as follows (in thousands):
 
 
 
Six Months Ended
June 30,
 
 
 
2018
 
2017
Decrease (increase) in current assets:
 
 
 
 
Receivables – related party
 
$
1,375

 
$
1,450

Receivables
 
576

 
(216
)
Prepaid expenses and other
 
37

 
366

Increase (decrease) in current liabilities:
 
 
 
 
Accounts payable
 
(2,763
)
 
738

Accounts payable – related party
 
3,696

 
(655
)
Accrued liabilities
 
(122
)
 
(118
)
Accrued liabilities – related party
 
(715
)
 
(3,171
)
Accrued interest payable
 
4,108

 
(304
)
Accrued interest payable – related party
 
(84
)
 
739

Taxes other than income taxes payable
 
(7
)
 
437

Changes in current assets and current liabilities
 
$
6,101

 
$
(734
)
Cash flows related to interest and income taxes paid were as follows (in thousands):
 
 
 
Six Months Ended
June 30,
 
 
 
2018
 
2017
Interest paid
 
$
21,641

 
$
16,044

Income taxes paid
 
918

 
695
Supplemental cash flow disclosures, noncash activities
Noncash investing and financing activities that affected recognized assets or liabilities were as follows (in thousands):
 
 
 
Six Months Ended
June 30,
 
 
 
2018
 
2017
Decrease in accounts payable related to capital expenditures
 
$
(1,718
)
 
$
(1,721
)
Noncash capital contributions from Valero for capital projects
 
22,317

 
19,276