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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2017
Guarantor Obligations [Line Items] |  |  |  |
Rent expenses | $ 2,578 | $ 2,599 | $ 2,568 |
Outstanding inventory purchase commitments | 18,418 | 22,309 |  |
Inventory purchase commitments, sole or limited suppliers | 6,939 | 9,235 |  |
Amount of claim, including interest, penalties and legal fees | 9,000 |  |  |
Principal Amount of Claim | 1,000 |  |  | $ 6,600
Aggregate amount of guarantees | 149,523 |  |  |
Restricted cash collateral | 32,451 |  |  |
Loss on inventory recognized from adjustments to future purchase commitments | 1,448 |  |  |
Amonunt of claim | 7,900 |  |  |
Peru [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Aggregate amount of guarantees | $ 136,003 |  |  |
OCS [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Percentage of amount funded for research and development projects | 100.00% |  |  |
Accrued royalties | $ 1,408 |  |  |
Royalties paid | $ 20 |  |  |
OCS [Member] | Minimum [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Royalty fee (as a percent) | 3.00% |  |  |
OCS [Member] | Maximum [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Royalty fee (as a percent) | 5.00% |  |  |
BIRD [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Royalty fee (as a percent) | 5.00% |  |  |
Percentage of amount funded for research and development projects | 150.00% |  |  |
Accrued royalties | $ 253 |  |  |
Spacenet Inc. [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Service expenses | $ 12,771 | $ 11,184 | $ 10,278 |

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