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Supplemental Cash Flow Information
 9 Months Ended
Sep. 30, 2019
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.
 
 
Nine Months Ended
September 30,
 
2019
 
2018
(Increase) decrease in:
 
 
 
Accounts receivable
$
6,294

 
$
87,318

Inventories
709

 
9,159

Deferred charges
135

 
(4,899
)
Other current assets
(10,358
)
 
(1,798
)
Decrease in:
 
 
 
Accounts payable
46,530

 
(68,974
)
Accrued liabilities
(48,954
)
 
6,524

Net changes in components of operating assets and liabilities
$
(5,644
)
 
$
27,330


Payments of interest and commitment fees were $145.4 million and $158.2 million for the nine months ended September 30, 2019 and September 30, 2018, respectively. We capitalized interest of $2.9 million and $2.7 million during the nine months ended September 30, 2019 and September 30, 2018, respectively.
At September 30, 2019 and September 30, 2018, we had incurred liabilities for fixed and intangible asset additions totaling $17.7 million and $16.6 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.