Share Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	7,899,926	8,365,493	9,142,276
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
option term	10
Option - Vesting Period	3
option vesting percent, year one	20.00%
option vesting percent, year two	50.00%
option vesting percent, year three	100.00%
Share Based Compensation Expense, Options	$ 1,700,000	$ 2,000,000	$ 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	21,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 6.17	$ 5.00	$ 2.30
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 20.32
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 49.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	5.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	900,000	1,400,000	1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	2,800,000
Long Term Incentive Shares - Vesting Period	3
Exercise Price Higher than Stock Price, shares	1,900,000
Options Exercise Price Lower than Share Price, Shares	560,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	7,600,000	8,500,000	4,300,000
Unrecognized Compensation Cost, nonvested options	1,000,000
Option Expense Not Yet Recognized Period for Recognition	0.7
Long Term Incentive Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	9,800,000
Option - Vesting Period	5-year
Weighted Average Grant Date Fair Value - Granted	$ 33.62	$ 32.65	$ 20.52
Long Term Incentive Shares - Vesting Period	5-year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	1.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	6,200,000	3,900,000	4,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	217,000
Profit Sharing Expense	8,200,000	6,600,000	8,100,000
shares in lieu of bonus [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	85,471	60,238	80,187
Percent Applied to Bonuses Taken in Cash	120.00%
Allocated Share-based Compensation Expense, Net of Tax	2,800,000	2,000,000	1,700,000
profit sharing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		17,769	23,849
Other Labor-related Expenses	868,000
Allocated Share-based Compensation Expense, Net of Tax		387,000	582,000
Profit Sharing, Percent of Salary, upper limit	5.00%
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	15.00%
ESPP, Maximum Percent of Salary Contributed	10.00%
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP	18,818	19,043	19,137
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 67,000	$ 78,000	$ 131,000
First Portion RSU [Member] \| 2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Monte Carlo RSU Valuation	146.00%	141.00%	175.00%
RSU First Portion Vesting, lower limit	50.00%
RSU First Portion Vesting, upper limit	200.00%
Share Based Compensation Arrangement By Share Based Payment Award, Award Vesting Period, RSU	three year
Second Portion RSU [Member] \| 2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU First Portion Vesting, lower limit	50.00%
RSU First Portion Vesting, upper limit	200.00%
Share Based Compensation Arrangement By Share Based Payment Award, Award Vesting Period, RSU	three year

The maximum percentage of salary an employee may direct to the Company's employee stock purchase plan.

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Number of options for which the exercise price is higher than the Company's stock price.

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The percentage applied to the RSU valuation as determined by a monte carlo simulation.

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The weighted average period over which unrecognized compensation is expected to be recognized for options as part of equity based compensation plans, using a decimal to express in number of years.

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No definition available.

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Number of options for which the exercise price is lower than the Company's share price.

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The length of time, in years, between the time of the issuance of an option and that option's expiration.

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The percentage of an option award that vests after two years.

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The percentage of an option awards that vests after one year.

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The percentage ratio applied to bonuses taken in stock instead of cash (at the employee's option).

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The maximum of employee base pay that may be contributed by the Company into a profit sharing plan.

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The vesting percentage of the Restricted Stock unit (upper limit).

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The vesting percentage of the Restricted Stock unit (lower limit).

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sharebasedcompexpenserelatedtooptions

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Unrecognized option costs.

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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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-Name Staff Accounting Bulletin (SAB)

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The amount of expense, net of income tax, 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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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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- Definition

The amount of plan compensation cost recognized during the period.

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-Publisher AICPA

-Name Statement of Position (SOP)

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-Paragraph 53

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This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.

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-Publisher AICPA

-Name Statement of Position (SOP)

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- Definition

Amount of payroll tax expense, compensation, postemployment and benefit-related expenses not elsewhere specified in the taxonomy (such as health plan, profit sharing, incentives, tuition reimbursement, other fringe benefits and perquisites) incurred in the period.

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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

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The minimum vesting term over 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.

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No definition available.

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- Definition

The discount rate from market value on purchase date that participants pay for shares.

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- Definition

The number of grants made 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).

+ References

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Number 123R

-Paragraph A240

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The weighted average period between the balance sheet date and expiration for equity-based awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), which may be expressed in a decimal value for number of years.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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 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.

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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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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

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-Name Accounting Standards Codification

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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