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Share-Based Payments (Share Options) (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| 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] |
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|
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| Balance at beginning of year (in shares) |
25,952 |
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| Granted (in shares) |
222,110 |
0 |
0 |
| Forfeited (in shares) |
(83,284) |
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| Expired (in shares) |
(12,544) |
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| Exercised (in shares) |
(36,037) |
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| Balance at end of year (in shares) |
116,197 |
25,952 |
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| Total Exercisable Shares |
116,197 |
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| Weighted Average Exercise Price at beginning of year |
$ 20.13 |
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| Weighted Average Exercise Price, Granted |
$ 64.11 |
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| Weighted Average Exercise Price, Forfeited |
$ 69.27 |
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| Weighted Average Exercise Price, Expired |
$ 81.78 |
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| Weighted Average Exercise Price, Exercised |
$ 11.46 |
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| Weighted Average Exercise Price at end of year |
$ 65.01 |
$ 20.13 |
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| Exercisable, Weighted Average Exercise Price |
$ 65.01 |
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| Weighted Average Remaining Contractual Term |
2 years 9 months 19 days |
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| Aggregate Intrinsic Value |
550,000 |
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| Exercisable, Weighted Average Remaining Contractual Term |
2 years 9 months 19 days |
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| Exercisable, Aggregate Intrinsic Value |
550,000 |
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| 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] |
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|
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| Number of Option Shares |
116,197 |
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| Weighted Average Remaining Contractual Life |
2 years 9 months 7 days |
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| Weighted Average Exercise Price of Option Shares |
$ 65.01 |
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| Number of Exercisable Option Shares |
116,197 |
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| Weighted Average Exercise Price of Exercisable Option Shares |
$ 65.01 |
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|
| Stock-based compensation expense |
$ 2,844,000 |
$ 1,622,000 |
$ 1,635,000 |
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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 0.00 To 9.99 [Member]
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract] |
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| Range of Exercise Prices, Lower Limit |
$ 0.00 |
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| Range of Exercise Prices, Upper Limit |
$ 9.99 |
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| Number of Option Shares |
29,602 |
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| Weighted Average Remaining Contractual Life |
5 years 0 months 2 days |
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| Weighted Average Exercise Price of Option Shares |
$ 9.91 |
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| Number of Exercisable Option Shares |
29,602 |
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| Weighted Average Exercise Price of Exercisable Option Shares |
$ 9.91 |
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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 10.00 To 19.99 [Member]
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract] |
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| Range of Exercise Prices, Lower Limit |
$ 10.00 |
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| Range of Exercise Prices, Upper Limit |
$ 19.99 |
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| Number of Option Shares |
2,879 |
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| Weighted Average Remaining Contractual Life |
1 year 0 months 1 day |
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| Weighted Average Exercise Price of Option Shares |
$ 17.36 |
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| Number of Exercisable Option Shares |
2,879 |
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| Weighted Average Exercise Price of Exercisable Option Shares |
$ 17.36 |
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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 20.00 To 29.99 [Member]
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract] |
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| Range of Exercise Prices, Lower Limit |
$ 20.00 |
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| Range of Exercise Prices, Upper Limit |
$ 29.99 |
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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 30.00 To 39.99 [Member]
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|
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract] |
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| Range of Exercise Prices, Lower Limit |
$ 30.00 |
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| Range of Exercise Prices, Upper Limit |
$ 39.99 |
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| Number of Option Shares |
4,051 |
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| Weighted Average Remaining Contractual Life |
3 years 1 month 22 days |
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| Weighted Average Exercise Price of Option Shares |
$ 30.86 |
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| Number of Exercisable Option Shares |
4,051 |
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| Weighted Average Exercise Price of Exercisable Option Shares |
$ 30.86 |
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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 40.00 To 49.99 [Member]
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract] |
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| Range of Exercise Prices, Lower Limit |
$ 40.00 |
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| Range of Exercise Prices, Upper Limit |
$ 49.99 |
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| Number of Option Shares |
349 |
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| Weighted Average Remaining Contractual Life |
4 years 5 months 26 days |
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| Weighted Average Exercise Price of Option Shares |
$ 44.49 |
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| Number of Exercisable Option Shares |
349 |
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| Weighted Average Exercise Price of Exercisable Option Shares |
$ 44.49 |
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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 50.00 To 146.41 [Member]
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract] |
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| Range of Exercise Prices, Lower Limit |
$ 50.00 |
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| Range of Exercise Prices, Upper Limit |
$ 146.41 |
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| Number of Option Shares |
79,316 |
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| Weighted Average Remaining Contractual Life |
1 year 11 months 14 days |
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| Weighted Average Exercise Price of Option Shares |
$ 89.14 |
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| Number of Exercisable Option Shares |
79,316 |
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| Weighted Average Exercise Price of Exercisable Option Shares |
$ 89.14 |
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Stock Option [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share Based Compensation Arrangement By Share Based Payment Award, Exercisable Period |
5 years |
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| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
3 years |
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| Share Based Compensation Arrangement By Share Based Payment Award, Maximum Term |
10 years |
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