| Lease, Cost [Table Text Block] |
| Three months ended | | Six months ended | | June 30, | | June 30, | | 2020 | | 2019 | | 2020 | | 2019 | Operating lease cost | $ | 1,449 | | $ | 1,610 | | $ | 2,826 | | $ | 2,852 | | | | | | | | | | | | | Finance lease cost: | | | | | | | | | | | | Amortization of right-of-use assets | $ | 73 | | $ | 70 | | $ | 140 | | $ | 136 | Interest on lease obligation | | 36 | | | 42 | | | 77 | | | 84 | Total finance lease cost | $ | 109 | | $ | 112 | | $ | 217 | | $ | 220 |
| June 30, | December 31, | | | 2020 | 2019 | | Operating Leases | | | | | | Operating lease right-of-use assets | $ | 24,692 | $ | 24,039 | | | | | | | | Accounts payable and accrued liabilities | $ | 3,474 | $ | 3,451 | | Operating lease obligation | | 22,230 | | 21,804 | | Total operating lease obligation | $ | 25,704 | $ | 25,255 | | | | | | | | Finance Leases | | | | | | Property, plant and equipment, at cost | $ | 3,468 | $ | 3,534 | | Accumulated depreciation and amortization | | (1,347) | | (1,296) | | Property, plant and equipment, net | $ | 2,121 | $ | 2,238 | | | | | | | | Current portion of long-term debt | $ | 180 | $ | 162 | | Long-term debt | | 1,683 | | 1,872 | | Total finance lease obligation | $ | 1,863 | $ | 2,034 | | | | | | | | Weighted-Average Remaining Lease Term (years) | | | | | | Operating leases | | 8.5 | | 8.4 | | Finance leases | | 10.2 | | 10.7 | | | | | | | | Weighted-Average Discount Rate | | | | | | Operating leases | | 4.2 | % | 4.7 | % | Finance leases | | 8.2 | % | 8.5 | % |
|
| Schedule Of Maturities Of Operating And Finance Leases Liabilities [Table Text Block] |
At June 30, 2020 | Operating | | Finance | | Leases | | Leases | Remainder of 2020 | $ | 2,447 | | $ | 190 | 2021 | | 4,582 | | | 309 | 2022 | | 4,277 | | | 291 | 2023 | | 3,889 | | | 262 | 2024 | | 3,357 | | | 242 | Thereafter | | 13,031 | | | 1,632 | Total lease payments | | 31,583 | | | 2,926 | Less imputed interest | | (5,879) | | | (1,063) | Total | $ | 25,704 | | $ | 1,863 |
|