Stock-Based Compensation (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Based Compensation (Textual) [Abstract]
Vesting period	2 years
Weighted average period for amortization of unrecognizable compensation for compensation arrangements	1 year 9 months 18 days
Common stock authorized under 2011 Plan	2,600,000
Shares available for grant under the 2011 Plan	2,401,590
Unrecognized compensation cost	$ 1,669,000
Stock-Based Compensation (Additional Textual) [Abstract]
Compensation expense charged against income	3,122,000	3,676,000	3,789,000
Actual tax benefit realized for the tax deductions from stock option exercises	6,411,000	2,103,000	2,704,000
Total intrinsic values of options exercised	17,163,000	6,262,000	8,446,000
Proceeds from stock options exercised	4,473,000	3,228,000	4,335,000
Weighted-average grant-date fair values of stock awards granted	$ 41.00	$ 35.79	$ 24.10
Total income tax benefit recognized in the income statement for share-based compensation arrangements	1,186,000	1,416,000	1,465,000
Maximum [Member]
Stock Based Compensation (Textual) [Abstract]
Period of expiration of stock options	10 years
Minimum [Member]
Stock Based Compensation (Textual) [Abstract]
Period of expiration of stock options	8 years
Stock Options [Member]
Stock Based Compensation (Textual) [Abstract]
Weighted average period for amortization of unrecognizable compensation for compensation arrangements	1 year
Weighted-average grant-date fair values of options awarded	$ 15.73	$ 13.81	$ 8.88
Unrecognized compensation cost	627,000
SARs [Member]
Stock Based Compensation (Textual) [Abstract]
Vesting period	2 years
Period of expiration	10 years
Weighted average period for amortization of unrecognizable compensation for compensation arrangements	1 year 1 month 6 days
Weighted-average grant-date fair values of options awarded	$ 15.73
Unrecognized compensation cost	815,000
SARs liability	$ 638,000

Share based compensation arrangement by share based payment award expiration period.

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Share based compensation arrangement by share based payment award options expiration period.

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Stock appreciation rights liabilities noncurrent.

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- Definition

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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