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Leases Leases - Additional Information (Details)
12 Months Ended
Dec. 31, 2014
Minimum [Member]  
Operating Leased Assets [Line Items]  
Lessee Leasing Arrangements, Operating Leases, Term of Contract 1 year
Maximum [Member]  
Operating Leased Assets [Line Items]  
Lessee Leasing Arrangements, Operating Leases, Term of Contract 83 years
Automatic lease extensions (in years) 79 years