Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2017

Supplemental Cash Flow Elements [Abstract]

Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents

The following table provides a reconciliation of cash, cash equivalents and restricted cash and cash equivalents with the Company's interim unaudited condensed consolidated balance sheet that sum to the total of the same such amounts shown in the interim unaudited condensed consolidated statements of cash flows:

(Thousands of U.S. Dollars)	As at September 30,				As at December 31,
	2017		2016		2016		2015
Cash and cash equivalents	$	15,125	$	48,073	$	25,175	$	145,342
Restricted cash and cash equivalents - current	3,920		13,198		8,322		92
Restricted cash and cash equivalents - long-term	10,332		9,993		9,770		3,317
	$	29,377	$	71,264	$	43,267	$	148,751

Schedule of Net Changes in Assets and Liabilities

Net changes in assets and liabilities from operating activities were as follows:

	Nine Months Ended September 30,
(Thousands of U.S. Dollars)	2017			2016
Accounts receivable and other long-term assets	$	8,356		$	15,233
Derivatives	—			(4,563		)
Inventory	(28		)	3,630
Prepaids	3,080			1,864
Accounts payable and accrued and other long-term liabilities	5,951			(11,297		)
Taxes receivable and payable	(45,464		)	13,230
Net changes in assets and liabilities from operating activities	$	(28,105	)	$	18,097

Schedule of Additional Supplemental Cash Flow Disclosures

The following table provides additional supplemental cash flow disclosures:

	Nine Months Ended September 30,
(Thousands of U.S. Dollars)	2017		2016
Non-cash investing activities:
Net liabilities related to property, plant and equipment, end of period	$	68,018	$	27,520