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Debt (Debt Issue Costs) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Amortization of deferred loan costs $ 2,200,000 $ 2,100,000 $ 2,100,000
Deferred loan costs written off 2,149,000 0 0
Senior unsecured notes due October 2021 [Member]
     
Debt Instrument [Line Items]      
Unamortized debt issuance expense $ 12,600,000