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Fair-Value Measurements (Changes In Fair Value Of Auction-Rate Security) (Details) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Fair-Value Measurements
Beginning balance	$ 6,039	$ 6,691
Unrealized gain	35	48
Partial redemption	(300)	(700)
Ending balance	$ 5,774	$ 6,039

The increase (decrease) of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issuances, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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