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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
The following table provides information regarding the net changes in components of operating assets and liabilities.
 
 
Six Months Ended
June 30,
 
2017
 
2016
(Increase) decrease in:
 
 
 
Accounts receivable
$
3,666

 
$
(21,274
)
Inventories
29,800

 
(34,512
)
Deferred charges
(93
)
 
(6,272
)
Other current assets
(2,115
)
 
(4,335
)
Decrease in:
 
 
 
Accounts payable
(6,843
)
 
(5,642
)
Accrued liabilities
(16,102
)
 
(18,206
)
Net changes in components of operating assets and liabilities
8,313

 
(90,241
)

Payments of interest and commitment fees were $80.0 million and $78.4 million for the six months ended June 30, 2017 and June 30, 2016, respectively. We capitalized interest of $11.9 million and $12.3 million during the six months ended June 30, 2017 and June 30, 2016.
At June 30, 2017 and June 30, 2016, we had incurred liabilities for fixed and intangible asset additions totaling $23.2 million and $55.6 million, respectively, that had not been paid at the end of the quarter, and, therefore, were not included in the caption “Payments to acquire fixed and intangible assets” under Cash Flows from Investing Activities in the Unaudited Condensed Consolidated Statements of Cash Flows.