Stockholders' Equity (Summary Of Repurchase Activity Under Repurchase Programs) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity [Abstract]
Prior year authorizations at January 1,	$ 13,237	$ 15,779	$ 12,862
Authorizations	5,590	5,750	15,000
Repurchases paid, Amount	(4,815)	(8,272)	(11,947)
Repurchases paid, Shares	137,429	294,059	673,066
Repurchases unsettled, Amount	(49)	(20)	(136)
Repurchases unsettled, Shares	1,688	538	3,898
Authorized dollars remaining as of December 31,	13,963	13,237	15,779
Repurchase of common stock	$ 4,835	$ 8,408	$ 12,326