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Other Long-Term Liabilities (Schedule Of Long-Term Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Other Long-Term Liabilities [Abstract]    
Deferred rent $ 10,302 $ 7,902
Lease incentives 4,088 3,205
Deferred gain on sale of campus building 1,256 1,537
Fair value of interest rate swap (see Note 7) 1,010  
Deferred payments (see Note 6) 5,000  
Long-term liabilities $ 21,656 $ 12,644