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Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2013
sqft
Dec. 31, 2012
Dec. 31, 2011
Related party transactions      
Future minimum lease commitments relating to leases $ 5,151,070,000    
Affiliates of the entity's Chairman
     
Related party transactions      
Area of executive office and warehouse space for buildings in Wyomissing, Pennsylvania leased (in square feet) 49,928    
Rent expense 1,100,000 1,000,000 900,000
Future minimum lease commitments relating to leases $ 6,200,000