Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details 1)

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Commitments and Contingencies (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
Estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases        
Future minimum operating lease payments, current       $ 219,650
Future minimum capital leases payments, current       23,264
Future minimum operating lease payments, in two years       220,027
Future minimum capital leases payments, in two years       23,119
Future minimum operating lease payments, in three years       214,152
Future minimum capital leases payments, in three years       22,868
Future minimum operating lease payments, in four years       206,969
Future minimum capital leases payments, in four years       23,030
Future minimum operating lease payments, in five years       196,054
Future minimum capital leases payments, in five years       22,807
Future minimum operating lease payments, thereafter       847,075
Future minimum capital leases payments, thereafter       115,293
Future minimum operating lease payments, total       1,903,927
Future minimum capital leases payments, total       230,381
Amounts representing interest payments       (89,209)
Present value of future minimum payments       141,172
Current portion of capital lease obligations 7,348     9,639
Capital lease obligations, less current portion 132,812     131,533
Commitments and Contingencies (Textual) [Abstract]        
Operating and capital leases with terms generally ranging       10 to 25 years
Liability for deferred lease expenses 30,454     34,466
Contribution payments (for plan year 2009 / 2010) 2,081     2,311
Liability recorded of approximately (for plan year 2011)       $ 2,443
Employment agreements initial term 3 years 2 years 3 years  
Employment agreements term extension   1 year 1 year