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Supplementary Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures | Total cash, cash equivalents and restricted cash are as follows:
| June 30, 2018 |  | December 31, 2017 |  | June 30, 2017 |  | December 31, 2016
| $ |  | $ |  | $ |  | $
Cash and cash equivalents | 454,933 |  |  | 445,452 |  |  | 600,881 |  |  | 567,994 |
Restricted cash – current | 55,466 |  |  | 38,179 |  |  | 108,535 |  |  | 107,672 |
Restricted cash – non-current | 34,627 |  |  | 68,543 |  |  | 105,342 |  |  | 129,576 |
| 545,026 |  |  | 552,174 |  |  | 814,758 |  |  | 805,242 |

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