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DEBT OBLIGATIONS (Details) ¥ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 CNY (¥) | Dec. 31, 2021 USD ($)
DEBT OBLIGATIONS |  |  |  |  |  |
Unamortized debt issuance costs | $ (365) |  | $ (365) |  |  | $ (435)
Finance lease obligations - noncurrent | 9,210 |  | 9,210 |  |  |
Long-term debt | 228,901 |  | 228,901 |  |  | 158,960
Maturities of long-term debt |  |  |  |  |  |
Remainder of 2022 | 368 |  | 368 |  |  |
Revolving Credit Facility |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Revolving Credit Facility, long-term | $ 220,056 |  | $ 220,056 |  |  | $ 159,395
Effective rate (as a percent) | 2.92% |  | 2.92% |  | 2.92% |
Amended Revolving Facility |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Maximum borrowing capacity | $ 225,000 |  | $ 225,000 |  |  |
Available borrowing capacity | 75,000 |  | $ 75,000 |  |  |
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent) |  |  | 0.225% |  |  |
Leverage ratio |  |  | 4.00% |  |  |
Unused amount of credit facility | 4,944 |  | $ 4,944 |  |  |
Amended Revolving Facility | Minimum |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent) |  |  | 0.10% |  |  |
Amended Revolving Facility | Maximum |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Commitment fees on unused portion of the Amended Revolving Facility ( as a percent) |  |  | 0.225% |  |  |
Amended Revolving Facility | LIBOR |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 1.75% |  |  |
Amended Revolving Facility | LIBOR | Minimum |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 1.00% |  |  |
Amended Revolving Facility | LIBOR | Maximum |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 1.75% |  |  |
Amended Revolving Facility | Prime Rate |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 1.25% |  |  |
Amended Revolving Facility | Prime Rate | Minimum |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 0.00% |  |  |
Amended Revolving Facility | Prime Rate | Maximum |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 1.25% |  |  |
China Credit Facility |  |  |  |  |  |
DEBT OBLIGATIONS |  |  |  |  |  |
Maximum borrowing capacity | 1,492 |  | $ 1,492 |  | ¥ 10,000 |
Average outstanding borrowings | $ 0 | $ 0 | $ 0 | $ 0 |  |

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