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LEASES - Capital and Operating Leases - (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Cost basis and accumulated depreciation of assets recorded under capital leases |  |
Depreciation expense recorded under capital leases | $ 7,299 | $ 7,235
Capital Leases |  |
2019 | 1,057 |
2020 | 376 |
2021 | 252 |
Total | 1,685 |
Less-portion representing interest at a weighted average annual rate of 5.0% | (147) |
Principal | 1,538 |
Less-current portion | (967) | (762)
Capital lease obligations, noncurrent portion | $ 571 | 941
Weighted average annual interest rate (as a percent) | 5.00% |
Operating Leases |  |
2019 | $ 3,524 |
2020 | 2,784 |
2021 | 2,334 |
2022 | 2,333 |
2023 | 2,213 |
2024 and thereafter | 6,340 |
Total future minimum lease payments | 19,528 |
Total |  |
2019 | 4,581 |
2020 | 3,160 |
2021 | 2,586 |
2022 | 2,333 |
2023 | 2,213 |
2024 and thereafter | 6,340 |
Future minimum lease payments | 21,213 |
Capital leases |  |
Cost basis and accumulated depreciation of assets recorded under capital leases |  |
Cost | 4,354 | 2,460
Accumulated depreciation | (951) | (424)
Net book value | 3,403 | 2,036
Depreciation expense recorded under capital leases | $ 527 | $ 295

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- Definition The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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