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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Other Long-Term Liabilities [Abstract]    
Loss on facilities not in use $ 18,752 $ 21,280
Deferred revenue, net of current portion 10,906 9,654
Deferred rent and other facility costs 8,570 8,646
Deferred payments related to acquisition 5,615 5,198
Lease incentives 1,144 1,056
Deferred gain on sale of campus building 273 $ 414
Fair value of interest rate swap (see Note 5) 238  
Total other long-term liabilities $ 45,498 $ 46,248