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Series A Notes, Net Of Current Maturities (Schedule Of Series A Notes, Net Of Current Maturities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Series A Notes, Net Of Current Maturities [Abstract] |  |  |  |
Series A Notes | $ 450,040 |  | $ 259,094 |
Less Current maturities | (58,275) |  | (29,612) |
Carrying amount adjustments on Series A Notes | 16,158 | [1] | 7,412 | [1]
Premium (discount) on Series A Notes, net | 687 |  | (1,575) |
Series A Notes, net of current maturities | $ 408,610 |  | $ 235,319 |
[1] | As a result of fair value hedge accounting, described below, and in Notes 2(Y) and 2(AA).

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