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Long Term Debt (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Stated interest rate on Secured Term Loan  
Variable interest rate, Stated Interest Rate 3.57%
Variable interest rate, Principal Balance $ 48,125
Fixed interest rate, Stated Interest Rate 5.15%
Fixed interest rate, Principal Balance 24,063
Weighted-average interest rate, Stated Interest Rate 4.10%
Weighted-average interest rate, Principal Balance $ 72,188