Basis Of Presentation (Effect On Consolidated Condensed Statements Of Changes In Stockholders' Equity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Retained Earnings, Beginning Balance			$ 406,342
Net income	20,381	19,577	71,530	61,522
Total comprehensive income	29,700	16,100	72,522	58,200
Retained Earnings, Ending Balance	430,121		430,121
As Previously Reported [Member]
Retained Earnings, Beginning Balance			422,458
Net income	18,309		60,004
Total comprehensive income			60,996
Retained Earnings, Ending Balance	434,711		434,711
Effect Of Change [Member]
Retained Earnings, Beginning Balance			(16,116)
Net income	2,072		11,526
Total comprehensive income			11,526
Retained Earnings, Ending Balance	$ (4,590)		$ (4,590)