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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other Long-Term Liabilities [Abstract]    
Deferred revenue, net of current portion $ 18,274 $ 17,981
Deferred rent and other facility costs 7,406 8,251
Loss on facilities not in use 6,227 7,813
Deferred payments related to acquisitions 5,979 13,754
Lease incentives 2,902 2,684
Total other long-term liabilities $ 40,788 $ 50,483