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Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Common Stock, shares outstanding 81,109 85,191
Building    
Property, Plant and Equipment [Line Items]    
Useful life 40 years  
Furniture and Equipment    
Property, Plant and Equipment [Line Items]    
Useful life 5 years