Stock Compensation Plans (Summary Activity Of Stock Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, Shares	965,344
Granted, Shares	180,081
Exercised, Shares	(305,630)
Forfeited, Shares	(1,445)
Expired, Shares	(546)
Outstanding at December 31, 2011, Shares	837,804
Exercisable at December 31, 2011, Shares	627,997
Exercisable and expected to vest at December 31, 2011, Shares	837,804
Weighted-Average Exercise Price, Outstanding at beginning of year	$ 8.50
Weighted-Average Exercise Price, Granted	$ 13.89
Weighted-Average Exercise Price, Exercised	$ 5.86
Weighted-Average Exercise Price, Forfeited	$ 13.89
Weighted-Average Exercise Price, Expired	$ 17.74
Weighted-Average Exercise Price, Outstanding at December 31, 2011	$ 10.61
Weighted-Average Exercise Price, Exercisable at December 31, 2011	$ 9.42
Weighted-Average Exercise Price, Exercisable and expected to vest at December 31, 2011	$ 10.61
Weighted-Average Remaining Contractual Term (in years), Outstanding at December 31, 2011	4.52
Weighted-Average Remaining Contractual Term (in years), Exercisable at December 31, 2011	3.87
Weighted-Average Remaining Contractual Term (in years), Exercisable and expected to vest at December 31, 2011	4.52
Aggregate Intrinsic Value, Outstanding at December 31, 2011	$ 4,376
Aggregate Intrinsic Value, Exercisable at December 31, 2011	4,060
Aggregate Intrinsic Value, Exercisable and expected to vest at December 31, 2011	4,376
Non-Employee Directors' Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, Shares	83,022
Granted, Shares
Exercised, Shares
Forfeited, Shares
Expired, Shares
Outstanding at December 31, 2011, Shares	83,022
Exercisable at December 31, 2011, Shares	83,022
Weighted-Average Exercise Price, Outstanding at beginning of year	$ 6.65
Weighted-Average Exercise Price, Granted
Weighted-Average Exercise Price, Exercised
Weighted-Average Exercise Price, Forfeited
Weighted-Average Exercise Price, Expired
Weighted-Average Exercise Price, Outstanding at December 31, 2011	$ 6.65
Weighted-Average Exercise Price, Exercisable at December 31, 2011	$ 6.65
Weighted-Average Remaining Contractual Term (in years), Outstanding at December 31, 2011	3.42
Weighted-Average Remaining Contractual Term (in years), Exercisable at December 31, 2011	3.42
Aggregate Intrinsic Value, Outstanding at December 31, 2011	686
Aggregate Intrinsic Value, Exercisable at December 31, 2011	$ 686