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Commitments and Contingencies (Leases) (Details)
12 Months Ended
Dec. 31, 2017
Operating Leased Assets [Line Items]  
Term of contract 40 years
Minimum [Member]  
Operating Leased Assets [Line Items]  
Initial lease term 5 years
Maximum [Member]  
Operating Leased Assets [Line Items]  
Initial lease term 15 years