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Commitments, Contingencies and Other Items (Syndicated Letter of Credit Facility) (Details) (Letter of Credit [Member], Reimbursement Agreement, USD $)
Mar. 31, 2014
Dec. 31, 2013
Letter of Credit [Member] | Reimbursement Agreement
   
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 180,000,000 $ 250,000,000
Line of Credit Facility, Maximum Borrowing Capacity $ 530,000,000