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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
(Increase) decrease in:
 
 
 
Accounts receivable
$
(21,274
)
 
$
202

Inventories
(34,512
)
 
(7,737
)
Deferred charges
(6,272
)
 
(7,725
)
Other current assets
(4,335
)
 
2,286

Increase (decrease) in:
 
 
 
Accounts payable
(5,642
)
 
(5,998
)
Accrued liabilities
(18,206
)
 
(16,067
)
Net changes in components of operating assets and liabilities
(90,241
)
 
(35,039
)

Payments of interest and commitment fees, net of amounts capitalized, were $78.4 million and $40.3 million for the six months ended June 30, 2016 and June 30, 2015, respectively. We capitalized interest of $12.3 million and $7.2 million during the six months ended June 30, 2016 and June 30, 2015.
At June 30, 2016 and June 30, 2015, we had incurred liabilities for fixed and intangible asset additions totaling $55.6 million and $52.9 million, respectively, that had not been paid at the end of the second 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.
At June 30, 2016 we had incurred liabilities for other asset additions totaling $0.1 million, that had not been paid at the end of the second quarter and, therefore, were not included in the caption "Other, net" under Cash Flows from Investing Activities in the Unaudited Condensed Consolidated Statements of Cash Flows.