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Supplemental Cash Flow Information
 3 Months Ended
Mar. 31, 2024
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Supplemental Cash Flow Information
The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents shown as a sum of these amounts in the interim unaudited condensed consolidated statements of cash flows:
As at March 31,As at December 31,
(Thousands of U.S. Dollars)2024202320232022
Cash and cash equivalents$126,618 $105,684 $62,146 $126,873 
Restricted cash and cash equivalents - current (1)
1,142 1,142 1,142 1,142 
Restricted cash and cash equivalents -
long-term (2)
7,778 5,710 7,750 5,343 
$135,538 $112,536 $71,038 $133,358 
(1) Included in other current assets on the Company’s condensed consolidated balance sheet.
(2) Included in other long-term assets on the Company’s condensed consolidated balance sheet.

Net changes in assets and liabilities from operating activities were as follows:
Three Months Ended March 31,
(Thousands of U.S. Dollars)20242023
Accounts receivable and other long-term assets$1,639 $(3,022)
PEF6,218 7,806 
Prepaids and inventory
1,967 740 
Accounts payable and accrued and other long-term liabilities(9,995)(17,252)
Taxes receivable and payable(13,126)965 
Net changes in assets and liabilities from operating activities$(13,297)$(10,763)

Changes in non-cash investing working capital for the three months ended March 31, 2024, were comprised of an increase in accounts payable and accrued liabilities of $16.6 million and an increase in accounts receivable of $0.1 million (three months ended March 31, 2023, an increase in accounts payable and accrued liabilities of $14.9 million).

The following table provides additional supplemental cash flow disclosures:
Three Months Ended March 31,
(Thousands of U.S. Dollars)20242023
Cash paid for withholding taxes$11,681 $8,461 
Cash paid for interest$1,224 $8,781 
Non-cash investing activities:
Net liabilities related to property, plant and equipment, end of period$63,947 $69,989