Comprehensive Earnings (Components Of Other Comprehensive Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Unrecognized gain (loss) and prior service cost arising during the period	$ 0	$ 0	$ 0	$ 0
Less: Amortization of prior service cost (gain) included in net earnings	10	(246)	29	(768)
Net change in unrecognized (loss) gain and prior service cost related to post-retirement plans	(10)	246	(29)	768
Amount of gain (loss) recognized in AOCE on derivatives (effective portion)	36,036	(41,163)	4,562	(37,517)
Less: Reclassification of loss from AOCE into earnings (effective portion)	(15,713)	(733)	(35,027)	(556)
Net unrecognized gain (loss) on derivatives	51,749	(40,430)	39,589	(36,961)
Unrealized gain on marketable securities	170	223	119	152
Less: Reclassification for gain included in net earnings	23	135	52	196
Net unrealized gain (loss) on marketable securities	147	88	67	(44)
Cash Flow Hedging
Less: Reclassification of loss from AOCE into earnings (effective portion)	$ (15,713)	$ (733)	$ (35,027)	$ (556)

Before tax amount of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost.

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Before tax amount of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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Before tax amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

Before tax and reclassification adjustments amount of unrealized holding gain (loss) and transfers on available-for-sale securities.

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