Share-Based Payments (Share Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 2,800,000	$ 1,600,000	$ 1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of year (in shares)	25,952
Granted (in shares)	222,110	0	0
Forfeited (in shares)	(83,284)
Expired (in shares)	(12,544)
Exercised (in shares)	(36,037)
Balance at end of year (in shares)	116,197	25,952
Total Exercisable Shares	116,197
Weighted Average Exercise Price at beginning of year	$ 20.13
Weighted Average Exercise Price, Granted	$ 64.11
Weighted Average Exercise Price, Forfeited	$ 69.27
Weighted Average Exercise Price, Expired	$ 81.78
Weighted Average Exercise Price, Exercised	$ 11.46
Weighted Average Exercise Price at end of year	$ 65.01	$ 20.13
Exercisable, Weighted Average Exercise Price	$ 65.01
Weighted Average Remaining Contractual Term	2 years 9 months 19 days
Aggregate Intrinsic Value	550,000
Exercisable, Weighted Average Remaining Contractual Term	2 years 9 months 19 days
Exercisable, Aggregate Intrinsic Value	550,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	410,000	5,000	65,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Number of Option Shares	116,197
Weighted Average Remaining Contractual Life	2 years 9 months 7 days
Weighted Average Exercise Price of Option Shares	$ 65.01
Number of Exercisable Option Shares	116,197
Weighted Average Exercise Price of Exercisable Option Shares	$ 65.01
Stock-based compensation expense	$ 2,844,000	$ 1,622,000	$ 1,635,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 0.00 To 9.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 0.00
Range of Exercise Prices, Upper Limit	$ 9.99
Number of Option Shares	29,602
Weighted Average Remaining Contractual Life	5 years 0 months 2 days
Weighted Average Exercise Price of Option Shares	$ 9.91
Number of Exercisable Option Shares	29,602
Weighted Average Exercise Price of Exercisable Option Shares	$ 9.91
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 10.00 To 19.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 10.00
Range of Exercise Prices, Upper Limit	$ 19.99
Number of Option Shares	2,879
Weighted Average Remaining Contractual Life	1 year 0 months 1 day
Weighted Average Exercise Price of Option Shares	$ 17.36
Number of Exercisable Option Shares	2,879
Weighted Average Exercise Price of Exercisable Option Shares	$ 17.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 20.00 To 29.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 20.00
Range of Exercise Prices, Upper Limit	$ 29.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 30.00 To 39.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 30.00
Range of Exercise Prices, Upper Limit	$ 39.99
Number of Option Shares	4,051
Weighted Average Remaining Contractual Life	3 years 1 month 22 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
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 40.00 To 49.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 40.00
Range of Exercise Prices, Upper Limit	$ 49.99
Number of Option Shares	349
Weighted Average Remaining Contractual Life	4 years 5 months 26 days
Weighted Average Exercise Price of Option Shares	$ 44.49
Number of Exercisable Option Shares	349
Weighted Average Exercise Price of Exercisable Option Shares	$ 44.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 50.00 To 146.41 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]
Range of Exercise Prices, Lower Limit	$ 50.00
Range of Exercise Prices, Upper Limit	$ 146.41
Number of Option Shares	79,316
Weighted Average Remaining Contractual Life	1 year 11 months 14 days
Weighted Average Exercise Price of Option Shares	$ 89.14
Number of Exercisable Option Shares	79,316
Weighted Average Exercise Price of Exercisable Option Shares	$ 89.14
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