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Supplemental Cash Flow Information
 3 Months Ended
Mar. 31, 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.
 
 
Three Months Ended
March 31,
 
2017
 
2016
(Increase) decrease in:
 
 
 
Accounts receivable
$
9,169

 
$
10,810

Inventories
6,009

 
(19,815
)
Deferred charges
(348
)
 
(3,479
)
Other current assets
(4,605
)
 
(5,090
)
Decrease in:
 
 
 
Accounts payable
(17,305
)
 
(19,850
)
Accrued liabilities
(21,988
)
 
(14,643
)
Net changes in components of operating assets and liabilities
(29,068
)
 
(52,067
)

Payments of interest and commitment fees, net of amounts capitalized, were $46.7 million and $45.8 million for the three months ended March 31, 2017 and March 31, 2016, respectively. We capitalized interest of $6.0 million and $6.0 million during the three months ended March 31, 2017 and March 31, 2016.
At March 31, 2017 and March 31, 2016, we had incurred liabilities for fixed and intangible asset additions totaling $31.6 million and $57.5 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.