Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Approximate Aggregate Minimum Future Rental Payments Required

As of December 31, 2012, the approximate aggregate minimum future rental payments required were as follows (in thousands):

2013	13,510,643
2014	12,305,134
2015	11,348,919
2016	9,962,731
2017	9,926,646
Thereafter	25,850,372
Total(1)	82,904,445