Stock-Based Compensation (Schedule Of Fair Value Of The Restricted Stock Awards Granted During The Periods) (Details) - Restricted Stock [Member] - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Time Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	63,104		90,000		524,903		576,578
Estimated fair value (in millions)	$ 1.3	[1]	$ 0.9	[1]	$ 12.7	[2]	$ 3.5	[2]
Time Vested [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	14,000		0		475,799		486,578
Estimated fair value (in millions)	$ 0.4	[1]	$ 0.0	[1]	$ 11.8	[2]	$ 2.6	[2]
Percentage of shares granted expected to be distributed	100.00%				95.00%		94.00%
Time Vested [Member] | Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	49,104		90,000		49,104		90,000
Estimated fair value (in millions)	$ 0.9	[1]	$ 0.9	[1]	$ 0.9	[2]	$ 0.9	[2]
Percentage of shares granted expected to be distributed	100.00%		100.00%		100.00%		100.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	21,000		0		173,373		152,373
Estimated fair value (in millions)	$ 0.5	[1]	$ 0.0	[1]	$ 4.5	[2]	$ 0.8	[2]
Performance Shares [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	21,000		0		173,373		152,373
Estimated fair value (in millions)	$ 0.5	[1]	$ 0.0	[1]	$ 4.5	[2]	$ 0.8	[2]
Percentage of shares granted expected to be distributed	87.00%				87.00%		70.00%
Performance Shares [Member] | Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0		0		0		0
Estimated fair value (in millions)	$ 0.0	[1]	$ 0.0	[1]	$ 0.0	[2]	$ 0.0	[2]

[1] Represents 100% of the grant date fair value. (We recognize the grant date fair value minus estimated forfeitures.)

[2] Represents 100% of the grant date fair value. (We recognize the grant date fair value minus estimated forfeitures.)