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Summary of Significant Accounting Policies (Property and Equipment) (Details)
12 Months Ended
Dec. 31, 2015
Minimum  
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful life 3 years
Maximum  
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful life 40 years
Rental Equipment  
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful life 15 years