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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 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:
 
 
Year Ended December 31,
 
2019
 
2018
 
2017
(Increase) decrease in:
 
 
 
 
 
Accounts receivable
$
(80,126
)
 
$
130,573

 
$
(140,948
)
Inventories
7,659

 
20,963

 
49,055

Deferred charges
4,093

 
(5,826
)
 
(3,622
)
Other current assets
(4,874
)
 
9,337

 
(410
)
Increase (decrease) in:
 
 
 
 
 
Accounts payable
81,915

 
(130,991
)
 
97,569

Accrued liabilities
(79,765
)
 
(26,208
)
 
8,512

Net changes in components of operating assets and liabilities
$
(71,098
)
 
$
(2,152
)
 
$
10,156


Payments of interest and commitment fees were $212.4 million, $228.3 million and $168.3 million during the years ended December 31, 2019, 2018 and 2017, respectively. We capitalized interest of $3.7 million, $3.4 million and $15.0 million during the years ended December 31, 2019, 2018 and 2017.
During the years ended December 31, 2019, 2018 and 2017, we paid taxes of $0.8 million, $0.2 million and $1.0 million.
At December 31, 2019, 2018 and 2017, we had incurred liabilities for fixed and intangible asset additions totaling $22.6 million, $9.4 million and $39.7 million, respectively, which had not been paid at the end of the year. Therefore, these amounts were not included in the caption “Payments to acquire fixed and intangible assets” under Cash Flows from Investing Activities in the Consolidated Statements of Cash Flows.