Stock-Based Compensation (Summary Of Stock-Based Awards) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Shares, Beginning balance	340
Vested, Shares	(80)
Forfeited, Shares	(38)
Non-vested shares outstanding, Shares, Ending balance	222
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Beginning balance	$ 16.81
Vested, Weighted-Average Grant Date Fair Value	$ 16.89
Forfeited, Weighted-Average Grant Date Fair Value	$ 16.35
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Ending balance	$ 16.86
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	103
Granted, Shares	271
Vested, Shares	(51)
Forfeited, Shares	(7)
Non-vested shares outstanding, Shares, Ending balance	316
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Beginning balance	$ 16.70
Granted, Weighted-Average Grant Date Fair Value	$ 17.54
Vested, Weighted-Average Grant Date Fair Value	$ 16.47
Forfeited, Weighted-Average Grant Date Fair Value	$ 17.31
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Ending balance	$ 17.45
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Shares, Beginning balance	164
Granted, Shares	76	[1]
Forfeited, Shares	(25)
Non-vested shares outstanding, Shares, Ending balance	215
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Beginning balance	$ 16.39
Granted, Weighted-Average Grant Date Fair Value	$ 17.37	[1]
Forfeited, Weighted-Average Grant Date Fair Value	$ 16.03
Non-vested shares outstanding, Weighted-Average Grant Date Fair Value, Ending balance	$ 16.78

[1] (1)Represents target number of shares that can vest based on the achievement of the performance goals.