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Derivatives (Derivative Instruments Consolidated Statement) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Trading Activity, Gains and Losses, Net [Line Items]    
Included in Interest Income / (Expense) $ 18,549us-gaap_InterestIncomeExpenseNet $ 18,196us-gaap_InterestIncomeExpenseNet
Interest Rate Swap    
Trading Activity, Gains and Losses, Net [Line Items]    
Included in Interest Income / (Expense) 0us-gaap_InterestIncomeExpenseNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 0us-gaap_InterestIncomeExpenseNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Included in Other Income / (Expense) $ 58us-gaap_OtherOperatingIncomeExpenseNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ (38)us-gaap_OtherOperatingIncomeExpenseNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember