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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Other Long-Term Liabilities [Abstract] |  |
Contract liabilities, net of current portion | $ 21,975 | $ 21,033
Employee separation costs | 7,477 |
Deferred rent and other facility costs | 6,942 | 7,113
Deferred payments related to acquisitions | 5,741 | 6,385
Loss on facilities not in use | 4,121 | 5,652
Lease incentives | 2,481 | 2,832
Other | 1,386 |
Total other long-term liabilities | $ 50,123 | $ 43,015

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