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DEBT OBLIGATIONS (Details) ¥ in Thousands, $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 28, 2016 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 CNY (¥) | Mar. 31, 2019 USD ($) | Dec. 06, 2018 USD ($)
Debt Obligations |  |  |  |  |  |
Long-term debt |  |  | $ 122,516 |  | $ 129,051 |
Unamortized debt issuance costs |  |  | (494) |  | (451) |
Revolving Credit Facility |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Long-term debt |  |  | 123,010 |  | 129,502 |
Maximum borrowing capacity | $ 125,000 |  |  |  |  |
Available borrowing capacity |  |  |  |  | $ 45,498 |
Commitment fees on unused portion of the Revolving credit facility ( as a percent) |  | 0.22% |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Commitment fees on unused portion of the Revolving credit facility ( as a percent) |  | 0.10% |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Commitment fees on unused portion of the Revolving credit facility ( as a percent) |  | 0.25% |  |  |  |
Revolving Credit Facility | LIBOR |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Applicable margin (as a percent) |  | 2.00% |  |  |  |
Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Applicable margin (as a percent) | 1.00% |  |  |  |  |
Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Applicable margin (as a percent) | 2.25% |  |  |  |  |
Revolving Credit Facility | Prime Rate |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Applicable margin (as a percent) |  | 1.00% |  |  |  |
Revolving Credit Facility | Prime Rate | Minimum |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Applicable margin (as a percent) | 0.00% |  |  |  |  |
Revolving Credit Facility | Prime Rate | Maximum |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Applicable margin (as a percent) | 1.25% |  |  |  |  |
Term Loan |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Effective rate (as a percent) |  |  |  | 4.26% | 4.26% |
Debt instrument term | 5 years |  |  |  |  |
Second Amendment |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Additional borrowing capacity |  |  |  |  |  | $ 50,000
Maximum borrowing capacity |  |  |  |  |  | $ 175,000
China Credit Facility |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | ¥ 10,000 | $ 1,490 |
Available borrowing capacity |  |  | 0 |  | $ 0 |
Average outstanding borrowings |  | $ 0 | $ 0 |  |  |

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