Derivatives And Fair Value Measurements (Changes In Level 3 Fair Values) (Details) (Fair Value Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings	$ (24,829)	$ (24,080)	$ 6,488	$ (24,618)
Balance at beginning of period	(5,533)	(9,873)	23,485	(4,931)
Balance at end of period	17,754	10,905	17,754	10,905
Total gains (losses) included in net derivative gains (losses) attributable to the change in unrealized gains (losses) related to assets still held at the reporting date	24,485	24,026	(2,476)	26,788
Derivative gains (losses) [Member]
Settlements	$ (1,542)	$ (3,302)	$ 757	$ (8,782)