Leases Leases - Textuals (Details)	Dec. 31, 2012
Operating Leased Assets [Line Items]
Automatic lease extensions (in years)	81 years
Minimum [Member]
Operating Leased Assets [Line Items]
Remaining lives of operating leases (in years)	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Remaining lives of operating leases (in years)	85 years