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Debt (Details Textuals) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Line of Credit Facility, Remaining Borrowing Capacity $ 582,400,000  
3.67% Senior Notes [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 50,000,000 50,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.67% 3.67%
6.3% Senior Notes [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 100,000,000 $ 100,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.30% 6.30%