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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Beginning balance January 1	$ 6,440	$ 5,285	$ 4,009
Gross increases for tax positions of prior years	1,828	3,049	2,138
Gross decreases for tax positions of prior years	(1,595)	(675)
Settlements	(338)	(517)	(628)
Lapse of statute of limitations	(787)	(702)	(234)
Ending balance December 31	$ 5,548	$ 6,440	$ 5,285

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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