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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Summary of Restrictions on Cash and Cash Equivalents
The following table provides a reconciliation of cash, cash equivalents and restricted cash and cash equivalents with the Company's consolidated balance sheet that sum to the total of the same such amounts shown in the consolidated statements of cash flows:

(Thousands of U.S. Dollars)
Year Ended December 31,
 
2018
 
2017
 
2016
Cash and cash equivalents
$
51,040

 
$
12,326

 
$
25,175

Restricted cash and cash equivalents - current
1,269

 
11,787

 
8,322

Restricted cash and cash equivalents - long-term(1)
1,999

 
2,565

 
9,770

 
$
54,308

 
$
26,678

 
$
43,267


(1) The long-term portion of restricted cash is included in other long-term assets on the Company's balance sheet.
Schedule of Net Changes in Assets and Liabilities
Net changes in assets and liabilities from operating activities were as follows:

 
Year Ended December 31,
 
2018
 
2017
 
2016
Accounts receivable and other long-term assets
$
17,674

 
$
(2,494
)
 
$
(29
)
Derivatives
1,017

 
—

 
(3,546
)
Inventory
(2,127
)
 
(78
)
 
5,510

Other prepaids
547

 
2,674

 
(615
)
Accounts payable and accrued and other long-term liabilities
9,034

 
15,617

 
(9,691
)
Prepaid tax and taxes receivable and payable
(47,566
)
 
(44,936
)
 
(2,966
)
Net changes in assets and liabilities from operating activities
$
(21,421
)
 
$
(29,217
)
 
$
(11,337
)
Schedule of Additional Supplemental Cash Flow Disclosures
The following table provides additional supplemental cash flow disclosures:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Cash paid for income taxes
$
46,277

 
$
54,505

 
$
64,067

Cash paid for interest
$
16,038

 
$
9,684

 
$
5,624

 
 
 
 
 
 
Non-cash investing activities:
 

 
 

 
 
Net liabilities related to property, plant and equipment, end of year
$
85,204

 
$
76,352

 
$
55,181