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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
17. Supplemental Cash Flow Information
a)Total cash, cash equivalents and restricted cash are as follows:
 
December 31, 2018
 
December 31, 2017
 
December 31, 2016
 
$
 
$
 
$
Cash and cash equivalents
424,169

 
445,452

 
567,994

Restricted cash – current
40,493

 
38,179

 
107,672

Restricted cash – non-current
40,977

 
68,543

 
129,576

 
505,639

 
552,174

 
805,242



The Company maintains restricted cash deposits relating to certain term loans, leasing arrangements, and project tenders.

b)The changes in operating assets and liabilities for the years ended December 31, 2018, 2017, and 2016, are as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Accounts receivable
(25,090
)
 
(1,925
)
 
96,497

Prepaid expenses and other
(30,808
)
 
3,118

 
9,690

Accounts payable
8,929

 
(14,499
)
 
(10,705
)
Accrued liabilities and other
32,215

 
118,137

 
(44,748
)
 
(14,754
)
 
104,831

 
50,734



c)
Cash interest paid, including realized interest rate swap settlements, during the years ended December 31, 2018, 2017, and 2016, totaled $242.9 million, $319.6 million and $341.0 million, respectively. In addition, during the years ended December 31, 2018, 2017, and 2016, cash interest paid relating to interest rate swap amendments and terminations totaled $13.7 million, $0.6 million and $8.1 million, respectively.
d)
As described in Note 22, in November 2017, Teekay Tankers acquired the outstanding shares of TIL through issuing 89.0 million Class A common shares, which was treated as a non-cash transaction in the Company's consolidated statement of cash flows. As a result of this transaction, Teekay Tankers acquired $37.6 million in cash and paid $6.8 million in professional fees.
e)
In 2018 and 2017, the portion of the distributions paid in kind by Teekay Offshore to the unitholders of Series C-1 Preferred Units and Series D Preferred Units, of $nil and $12.7 million, respectively, was treated as a non-cash transaction in the consolidated statements of cash flows.