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Summary of Significant Accounting Policies (Concentration of Credit Risk) (Details)
12 Months Ended
Dec. 31, 2018
customer
Concentration Risk [Line Items]  
Number of customers (in customers) 1,084
Sales Revenue, Net | Geographic Concentration Risk  
Concentration Risk [Line Items]  
Concentration risk 10.00%
Sales Revenue, Net | Customer Concentration Risk  
Concentration Risk [Line Items]  
Number of customers (in customers) 0
Concentration risk 4.30%
Sears Holding Corporation | Sales Revenue, Net | Customer Concentration Risk  
Concentration Risk [Line Items]  
Concentration risk 0.80%