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Supplemental Cash Flow Information
 3 Months Ended
Mar. 31, 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.
 
 
Three Months Ended
March 31,
 
2016
 
2015
(Increase) decrease in:
 
 
 
Accounts receivable
$
10,810

 
$
70,903

Inventories
(19,815
)
 
(16,973
)
Deferred charges
(3,479
)
 
(3,103
)
Other current assets
(5,090
)
 
(4,722
)
Increase (decrease) in:
 
 
 
Accounts payable
(19,850
)
 
(37,826
)
Accrued liabilities
(14,643
)
 
(2,343
)
Net changes in components of operating assets and liabilities
(52,067
)
 
5,936


Payments of interest and commitment fees, net of amounts capitalized, were $45.8 million and $14.2 million for the three months ended March 31, 2016 and March 31, 2015, respectively. We capitalized interest of $6.0 million and $3.0 million during the three months ended March 31, 2016 and March 31, 2015.
At March 31, 2016 and March 31, 2015, we had incurred liabilities for fixed and intangible asset additions totaling $57.5 million and $73.7 million, respectively, that had not been paid at the end of the first 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 March 31, 2016 we had incurred liabilities for other asset additions totaling $0.3 million, that had not been paid at the end of the first 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.