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