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Other Long-Term Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of other long-term liabilities    
Deferred rent and other facility costs $ 11,650 $ 10,302
Deferred payments (see Note 5) 4,919 5,000
Lease incentives 3,150 4,088
Fair value of interest rate swap (see Note 6) 1,211 1,010
Deferred gain on sale of campus building 975 1,256
Total other long-term liabilities $ 21,905 $ 21,656