Provision For Income Taxes (Reconciliation Of Unrecognized Income Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Sep. 30, 2011
Provision For Income Taxes [Abstract]
Balance at January 1	$ 11,215	$ 11,704	$ 12,249	$ 2,800
Gross increases for tax positions of prior years	252	878	266
Gross decreases for tax positions of prior years	(84)	(301)	(1,014)
Gross increases for tax positions of current year	562	219	803
Lapse of statute of limitations	(7,867)	(1,285)	(141)
Settlements			(459)
Balance at December 31	$ 4,078	$ 11,215	$ 11,704	$ 2,800