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COMMITMENTS AND CONTINGENCIES. (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of future minimum lease payments - Capital and Operating Leases | Future minimum lease payments required by non-cancelable leases in effect at December 31, 2018 were as follows (in thousands):
Years Ended December 31, |  | Capital Leases |  |  | Operating Leases |
2019 |  | $ | 45 |  |  | $ | 10,207 |
2020 |  |  | 45 |  |  |  | 8,423 |
2021 |  |  | 33 |  |  |  | 5,441 |
2022 |  |  | — |  |  |  | 5,233 |
2023 |  |  | — |  |  |  | 4,511 |
Thereafter |  |  | — |  |  |  | 8,413 |
Total minimum payments |  |  | 123 |  |  | $ | 42,228 |
Obligations due within one year |  |  | (45 | ) |  |  |  |
Long-term obligations under capital leases |  | $ | 78 |  |  |  |  |

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