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Financial Derivatives - Schedule of Derivative Instruments, Impact on Results of Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (22,600) $ (19,700) $ (18,000)
Gains/(losses) on financial derivatives and hedging activities 2,531 (21,646) 31,764
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 3,100 14,520 (18,230)
Gain (Loss) on Fair Value Hedges Recognized in Earnings 9,065 11,791 11,308
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains/(losses) on financial derivatives and hedging activities (5,983) (33,427) 20,495
Interest Rate Swap [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on Components Included from Assessment of Interest Rate Fair Value Hedge Effectiveness 9,200 11,600 11,800
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net 100 (200) 500
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 5,965 (2,729) 29,538
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness (551) (10) (39)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net (551) (10) (39)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains/(losses) on financial derivatives and hedging activities (3,204) (31,101) 21,394
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains/(losses) on financial derivatives and hedging activities (2,440) (1,842) (1,002)
Future [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains/(losses) on financial derivatives and hedging activities $ (339) $ (484) $ 103