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Long-Term Debt (Details 1)
 3 Months Ended
Mar. 31, 2013
Financial covenants include required specified ratios  
Required consolidated liquidity ratio 1.05
Required consolidated fixed charge coverage ratio 1.20
Required Consolidated Total Lease Adjusted Leverage Ratio 5.50
Actual consolidated liquidity ratio 1.12
Actual consolidated fixed charge coverage ratio 1.68
Actual consolidated lease adjusted leverage ratio 3.90