Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) - Other Income [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Not Designated as Hedging Instrument [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ (6,744)	$ (5,310)	$ (18,090)	$ (2,428)
Not Designated as Hedging Instrument [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	6,869	5,310	18,498	2,428
Designated as Hedging Instrument [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	43	(78)	164	(12)
Designated as Hedging Instrument [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ 6	$ (7)	$ 4	$ 2