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v3.19.3.a.u2

Summary of Significant Accounting Policies and Other Items - Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Significant Accounting Policies and Other Items |  |  |
Balance at Beginning of Period | $ 7,310 | $ 5,885 | $ 4,770
Expense (recovery) | 2,552 | 1,451 | 1,259
Write off | (90) |  | (103)
Other |  | (26) | (41)
Balance at End of Period | $ 9,772 | $ 7,310 | $ 5,885

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