Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Other Long-Term Liabilities [Abstract]
Deferred payments related to acquisition	$ 13,727	$ 13,754
Deferred revenue, net of current portion	17,940	17,981
Loss on facilities not in use	6,964	7,813
Deferred rent and other facility costs	7,919	8,251
Lease incentives	2,667	2,684
Total other long-term liabilities	$ 49,217	$ 50,483