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Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Long-Term Liabilities [Abstract] |
Schedule of other long-term liabilities | Other long-term liabilities consist of the following as of December 31, 2017 and 2018 (in thousands):
|  | 2017 |  | 2018
Contract liabilities, net of current portion |  | $ | 21,033 |  | $ | 23,880
Deferred rent and other facility costs |  |  | 7,113 |  |  | 6,837
Employee separation costs |  |  | — |  |  | 6,800
Deferred payments related to acquisitions |  |  | 6,385 |  |  | 5,904
Loss on facilities not in use |  |  | 5,652 |  |  | 4,332
Lease incentives |  |  | 2,832 |  |  | 2,300
Other |  |  | — |  |  | 1,263
Other long-term liabilities |  | $ | 43,015 |  | $ | 51,316

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