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Other Long-Term Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of other long-term liabilities    
Deferred rent and other facility costs $ 11,901 $ 11,650
Deferred payments related to acquisition 4,915 4,919
Lease incentives 3,086 3,150
Deferred taxes 1,406   
Fair value of interest rate swap (see Note 3) 980 1,211
Deferred gain on sale of campus building 905 975
Total other long-term liabilities $ 23,193 $ 21,905