Stock-Based Compensation (Summary Of Stock-Based Awards) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Shares, Beginning balance	244
Granted, Shares	210
Vested, Shares	(45)
Forfeited, Shares	(24)
Non-vested shares outstanding, Shares, Ending balance	385
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Beginning balance	$ 18.23
Granted, Weighted-Average Grant Date Fair Value	$ 15.56
Vested, Weighted-Average Grant Date Fair Value	$ 18.42
Forfeited, Weighted-Average Grant Date Fair Value	$ 17.53
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Ending balance	$ 16.80
Restricted Stock Units And Phantom Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Shares, Beginning balance	83
Granted, Shares	95
Vested, Shares	(38)
Forfeited, Shares	(13)
Non-vested shares outstanding, Shares, Ending balance	127
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Beginning balance	$ 17.88
Granted, Weighted-Average Grant Date Fair Value	$ 15.50
Vested, Weighted-Average Grant Date Fair Value	$ 16.67
Forfeited, Weighted-Average Grant Date Fair Value	$ 17.05
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Ending balance	$ 16.55
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Shares, Beginning balance	68
Granted, Shares	103	[1]
Forfeited, Shares	(7)
Non-vested shares outstanding, Shares, Ending balance	164
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Beginning balance	$ 18.57
Granted, Weighted-Average Grant Date Fair Value	$ 15.11	[1]
Forfeited, Weighted-Average Grant Date Fair Value	$ 18.57
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Ending balance	$ 16.39

[1] Represents target number of shares that can vest based on the achievement of certain performance criteria.