Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Schedule Of Assets And Liabilities Measured At Fair Value

	Level 2
(In thousands)	Fair Value Measurement Category
	March 31, 2012		December 31, 2011		March 26, 2011
Assets
Commodity contracts—fuel	$	790	$	—	$	4,511
Foreign exchange contracts		341		341		633
Liabilities:
Commodity contracts—fuel		—	$	251		—
Foreign exchange contracts	$	435		92	$	331

Schedule Of Fair Value Of Senior Notes

	March 31, 2012				December 31, 2011				March 26, 2011
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
$400 million senior notes	$	150,027	$	155,637	$	399,953	$	381,067	$	400,032	$	404,800
$250 million senior secured notes	$	250,000	$	259,379		—		—		—		—