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Employee Benefit Plans (Stock Options Outstanding And Exercisable) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
No. of Options Outstanding (in shares)	180,554
Aggregate Intrinsic Value (in thousands)	$ 1,824
No. of Options Currently Exercisable (in shares)	92,832
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands)	898
Ranges Of Exercise Prices 26.62 - 33.90 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
No. of Options Outstanding (in shares)	51,750
Weighted-Average Exercise Price (in dollars per share)	$ 30.47
Weighted-Average Remaining Contractual Life (Years)	4 years 6 months
Aggregate Intrinsic Value (in thousands)	821
No. of Options Currently Exercisable (in shares)	26,332
Weighted-Average Exercise Price of Options Currently Exercisable (in dollars per share)	$ 30.44
Weighted-Average Remaining Contractual Life (Years)	3 years 5 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands)	419
Ranges Of Exercise Prices 26.62 - 33.90 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices (in dollars per share)	$ 26.62
Ranges Of Exercise Prices 26.62 - 33.90 [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices (in dollars per share)	$ 33.90
Ranges Of Exercise Prices 35.09 - 44.43 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
No. of Options Outstanding (in shares)	128,804
Weighted-Average Exercise Price (in dollars per share)	$ 38.54
Weighted-Average Remaining Contractual Life (Years)	5 years 7 months
Aggregate Intrinsic Value (in thousands)	1,003
No. of Options Currently Exercisable (in shares)	66,500
Weighted-Average Exercise Price of Options Currently Exercisable (in dollars per share)	$ 39.13
Weighted-Average Remaining Contractual Life (Years)	2 years 10 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands)	$ 479
Ranges Of Exercise Prices 35.09 - 44.43 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices (in dollars per share)	$ 35.09
Ranges Of Exercise Prices 35.09 - 44.43 [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ranges Of Exercise Prices (in dollars per share)	$ 44.43

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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