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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Long-Term Liabilities [Abstract]
Deferred revenue, net of current portion	$ 21,033	$ 17,981
Deferred rent and other facility costs	7,113	8,251
Deferred payments related to acquisitions	6,385	13,754
Loss on facilities not in use	5,652	7,813
Lease incentives	2,832	2,684
Total other long-term liabilities	$ 43,015	$ 50,483

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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