Supplemental Cash Flow Information Items - Changes in Non-cash Working Capital (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Supplemental Cash Flow Elements [Abstract] | |||
| Trade and other receivables | $ 1,176 | $ (3,930) | $ (1,196) |
| Other current assets | (4,708) | (414) | (725) |
| Accounts payable and accrued liabilities | 11,097 | 6,010 | 2,314 |
| Change in non-cash working capital items | $ 7,565 | $ 1,666 | $ 393 |