Income Taxes (Schedule Of Changes In Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Total amounts of unrecognized tax benefits, beginning of period	$ 5,149	$ 4,976	$ 5,429
Gross increases in unrecognized tax benefits as a result of tax positions taken during a prior period	290
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	1,436	1,241	972
Decreases in unrecognized tax benefits as a result of a lapse of the applicable statutes of limitations	(969)	(1,068)	(1,425)
Total amounts of unrecognized tax benefits, end of period	$ 5,906	$ 5,149	$ 4,976