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Other Long-Term Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of other long-term liabilities    
Deferred rent $ 11,384 $ 10,302
Lease incentives 4,036 4,088
Deferred gain on sale of campus building 1,046 1,256
Fair value of interest rate swap (see Note 5) 896 1,010
Deferred payments (see Note 3) 4,953 5,000
Total other long-term liabilities $ 22,315 $ 21,656