Stock-Based Compensation (Schedule Of Fair Value Of The Restricted Stock Awards Granted During The Periods) (Details) (Restricted Stock [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	21,128	24,606	469,677	392,542
Estimated fair value (in millions)	$ 0.9	$ 1.0	$ 21.9	$ 16.6
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0	0	448,549	367,936
Estimated fair value (in millions)	0	0	21.0	15.6
Percentage of shares granted expected to be distributed			94.00%	89.00%
Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	21,128	24,606	21,128	24,606
Estimated fair value (in millions)	$ 0.9	$ 1.0	$ 0.9	$ 1.0
Percentage of shares granted expected to be distributed	100.00%	100.00%	100.00%	100.00%