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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Other Long-Term Liabilities [Abstract]    
Deferred payments related to acquisitions $ 20,773 $ 6,078
Deferred revenue, net of current portion 12,221 14,429
Loss on facilities not in use 11,888 15,229
Deferred rent and other facility costs 9,112 8,993
Lease incentives 3,035 3,125
Deferred gain on sale of campus building 62 133
Total other long-term liabilities $ 57,091 $ 47,987