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Stock-Based Compensation (Details 3) (Stock Appreciation Rights (Sars) [Member], USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Stock Appreciation Rights (Sars) [Member]
Balance, beginning (in shares)	332,586
Granted, (in shares)	83,968
Exercised, (in shares)	(49,344)
Balance, ending (in shares)	367,210
Exercisable, (in shares)	219,679
Outstanding, weighted average exercise price	$ 26.87
Granted, weighted average exercise price	$ 36.92
Exercised, weighted average exercise price	$ 24.64
Outstanding, weighted average exercise price	$ 29.47
Exercisable, weighted average exercise price	$ 25.83
Outstanding, average remaining contractual term years, beginning	7 years 5 months 1 day
Outstanding, average remaining contractual term years, ending	7 years 4 months 20 days
Exercisable, average remaining contractual term years	6 years 3 months 29 days
Outstanding, aggregate intrinsic value	$ 3,166
Outstanding, aggregate intrinsic value	4,590
Exercisable, aggregate intrinsic value	$ 3,545

X

- Definition

The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

+ References

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- Definition

The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

+ References

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

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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- Definition

Net number of share options (or share units) granted during the period.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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