Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) - Other Income [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Not Designated as Hedging Instrument [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ 11,346	$ 2,882
Not Designated as Hedging Instrument [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	(11,630)	(2,882)
Designated as Hedging Instrument [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	121	66
Designated as Hedging Instrument [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ (2)	$ (9)