Share-Based Payments (Share Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of year (in shares)	64,912
Granted (in shares)	0	0	0
Forfeited (in shares)	(1,000)
Expired (in shares)	(37,444)
Exercised (in shares)	(516)
Balance at end of year (in shares)	25,952	64,912
Total Exercisable Shares	25,952
Weighted Average Exercise Price at beginning of year	$ 22.76
Weighted Average Exercise Price, Granted	$ 0.00
Weighted Average Exercise Price, Forfeited	$ 23.29
Weighted Average Exercise Price, Expired	$ 24.71
Weighted Average Exercise Price, Exercised	$ 12.21
Weighted Average Exercise Price at end of year	$ 20.13	$ 22.76
Exercisable, Weighted Average Exercise Price	$ 20.13
Weighted Average Remaining Contractual Term	1 year 3 months 18 days
Aggregate Intrinsic Value	$ 27
Exercisable, Weighted Average Remaining Contractual Term	1 year 3 months 18 days
Exercisable, Aggregate Intrinsic Value	27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	5	65	154
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Number of Option Shares	25,952
Weighted Average Remaining Contractual Life	1 year 3 months
Weighted Average Exercise Price of Option Shares	$ 20.13
Number of Exercisable Option Shares	25,952
Weighted Average Exercise Price of Exercisable Option Shares	$ 20.13
Stock-based compensation expense	$ 1,622	$ 1,635	$ 1,424
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 12.35 To 15.43 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 12.35
Range of Exercise Prices, Upper Limit	$ 15.43
Number of Option Shares	6,395
Weighted Average Remaining Contractual Life	0 years 9 months
Weighted Average Exercise Price of Option Shares	$ 14.04
Number of Exercisable Option Shares	6,395
Weighted Average Exercise Price of Exercisable Option Shares	$ 14.04
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 15.44 To 18.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 15.44
Range of Exercise Prices, Upper Limit	$ 18.51
Number of Option Shares	3,240
Weighted Average Remaining Contractual Life	0 years 5 months
Weighted Average Exercise Price of Option Shares	$ 17.28
Number of Exercisable Option Shares	3,240
Weighted Average Exercise Price of Exercisable Option Shares	$ 17.28
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 18.52 To 21.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 18.52
Range of Exercise Prices, Upper Limit	$ 21.60
Number of Option Shares	7,266
Weighted Average Remaining Contractual Life	1 year 3 months
Weighted Average Exercise Price of Option Shares	$ 18.61
Number of Exercisable Option Shares	7,266
Weighted Average Exercise Price of Exercisable Option Shares	$ 18.61
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 21.61 To 24.68 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 21.61
Range of Exercise Prices, Upper Limit	$ 24.68
Number of Option Shares	5,000
Weighted Average Remaining Contractual Life	0 years 2 months
Weighted Average Exercise Price of Option Shares	$ 23.29
Number of Exercisable Option Shares	5,000
Weighted Average Exercise Price of Exercisable Option Shares	$ 23.29
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 27.78 To 30.86 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 27.78
Range of Exercise Prices, Upper Limit	$ 30.86
Number of Option Shares	4,051
Weighted Average Remaining Contractual Life	4 years 1 month 10 days
Weighted Average Exercise Price of Option Shares	$ 30.86
Number of Exercisable Option Shares	4,051
Weighted Average Exercise Price of Exercisable Option Shares	$ 30.86
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Exercisable Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share Based Compensation Arrangement By Share Based Payment Award, Maximum Term	10 years