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Guarantees And Contingencies (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Guarantees And Contingencies [Abstract]    
Total long-term debt obligations $ 705,219,000  
Long-term debt obligations due within one year 26,471,000  
Long-term debt obligations due in second and third years 124,714,000  
Long-term debt obligations due in fourth and fifth years 137,006,000  
Long-term debt obligations due after fifth year 417,028,000  
Total operating lease obligations 145,935,000 [1]  
Operating lease obligations due within one year 14,207,000 [1]  
Operating lease obligations due in second and third years 48,393,000 [1]  
Operating lease obligations due in fourth and fifth years 34,187,000 [1]  
Operating lease obligations due after fifth year 49,148,000 [1]  
Total purchase obligations 1,653,000  
Purchase obligations due within one year 795,000  
Purchase obligations due in second and third years 785,000  
Purchase obligations due in fourth and fifth years 73,000  
Total obligations 852,807,000  
Total obligations due within one year 41,473,000  
Total obligations due in second and third years 173,892,000  
Total obligations due in fourth and fifth years 171,266,000  
Total obligations due after fifth year 466,176,000  
Non-cancelable sublease income   $ 3,700,000
[1] Net of $3.7 million of sublease income to be received from properties which we have subleased to other parties.