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Debt (Details Textuals) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Debt Instrument [Line Items]    
Line of Credit Facility, Remaining Borrowing Capacity $ 690,900,000  
Debt Issuance Costs (281,000) 0
4.10% Senior Notes [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 50,000,000  
Debt Instrument, Interest Rate, Stated Percentage 4.10%  
Debt Issuance Costs $ (281,000)  
Debt Issuance Costs Amortization Period 10  
Minimum Prepayment Percent 10.00%