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Other Long-Term Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2017
Other Long-Term Liabilities [Abstract] |
Schedule of other long-term liabilities |
|  | December 31, 2016 |  | June 30, 2017 |
Deferred revenue, net of current portion |  | $ | 17,981 |  | $ | 19,011 |
Deferred payments related to acquisitions |  |  | 13,754 |  |  | 11,915 |
Deferred rent and other facility costs |  |  | 8,251 |  |  | 7,728 |
Loss on facilities not in use |  |  | 7,813 |  |  | 6,703 |
Lease incentives |  |  | 2,684 |  |  | 2,621 |
Other long-term liabilities |  | $ | 50,483 |  | $ | 47,978 |

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