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

+ References

No definition available.

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- Definition

Employees may elect to receive bonuses or commissions in the form of common shares in lieu of cash ("Bonus Shares"). By making such election, the employee receives shares equal to this percentage of the cash value of the bonus or commission, less applicable withholding tax.

+ References

No definition available.

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- Definition

The percentage of an award that vests over a period of time.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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

+ References

No definition available.

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- Definition

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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Aggregate number of common shares reserved for future issuance.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph (SX 210.5-02.29)

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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-Name Accounting Principles Board Opinion (APB)

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The number of shares issued pursuant to the terms of the deferred compensation plan as of the balance sheet date.

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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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- Definition

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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Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

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No definition available.

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The amount of plan compensation cost recognized during the period.

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

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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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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph a

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Weighted average remaining contractual term for vested portions of options outstanding and currently 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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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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-Name Statement of Financial Accounting Standard (FAS)

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

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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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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)

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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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Share Based Compensation (Details) (USD $)	12 Months Ended
Share Based Compensation (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Options [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	21,100,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Common Stock, Capital Shares Reserved for Future Issuance	7,156,179	7,899,926	8,365,493
ESPP [Member]
Options [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	750,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
ESPP, Maximum percent of salary contributed	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	15.00%
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP	18,611	18,818	19,043
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 99,000	$ 67,000	$ 78,000
Stock Options [Member]
Options [Abstract]
option term	10 years
Option - Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 6.55	$ 6.17	$ 5.00
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 years 5 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 5 months 4 days
Exercise Price Higher than Stock Price, shares	905,000
Options Exercise Price Lower than Share Price, Shares	1,069,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	5,900,000	900,000	1,400,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	22,900,000	7,600,000	8,500,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	652,000
Option Expense Not Yet Recognized Period for Recognition	0 years 8 months 27 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	6,500,000
Allocated Share-based Compensation Expense	1,700,000	1,700,000	2,000,000
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
Allocated Share-based Compensation Expense	1,700,000	1,700,000	2,000,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Allocated Share-based Compensation Expense	1,700,000	1,700,000	2,000,000
Stock Options [Member] \| First Anniversary of Grant Date [Member]
Options [Abstract]
option vesting percent, year one	20.00%
Stock Options [Member] \| Second Anniversary of Grant Date [Member]
Options [Abstract]
option vesting percent, year one	50.00%
Stock Options [Member] \| Third Anniversary of Grant Date [Member] [Member]
Options [Abstract]
option vesting percent, year one	100.00%
Long Term Incentive Shares [Member]
Options [Abstract]
Option - Vesting Period	5 years
Allocated Share-based Compensation Expense	8,700,000	8,200,000	6,600,000
Long Term Incentive Shares [Abstract]
Weighted Average Grant Date Fair Value - Granted	$ 34.61	$ 33.62	$ 32.65
Long Term Incentive Shares - Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 6 months 27 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	417,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	7,500,000	6,200,000	3,900,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	12,500,000
Allocated Share-based Compensation Expense	8,700,000	8,200,000	6,600,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Allocated Share-based Compensation Expense	8,700,000	8,200,000	6,600,000
2008 Plan [Member] \| Third Anniversary of Grant Date [Member] [Member] \| Maximum [Member]
Options [Abstract]
option vesting percent, year one	200.00%
2008 Plan [Member] \| First portion of RSU [Member] \| Third Anniversary of Grant Date [Member] [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
2008 Plan [Member] \| Second portion of RSU [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
shares in lieu of bonus [Member]
Options [Abstract]
Allocated Share-based Compensation Expense	2,900,000	2,800,000	2,000,000
Long Term Incentive Shares [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	80,573	85,471	60,238
Allocated Share-based Compensation Expense	2,900,000	2,800,000	2,000,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Percent Applied to Bonuses Taken in Cash	120.00%
Allocated Share-based Compensation Expense	2,900,000	2,800,000	2,000,000
Profit Sharing Plan [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Other Labor-related Expenses	$ 564,000	$ 868,000	$ 387,000
Deferred Compensation Arrangement with Individual, Shares Issued			17,769
Executives, all [Member] \| 2008 Plan [Member] \| First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation		146.00%	141.00%
Deferred Profit Sharing [Member] \| Profit Sharing Plan [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
ESPP, Maximum percent of salary contributed	5.00%
Chief Executive Officer [Member] \| 2008 Plan [Member] \| First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation	159.00%
Executives Other [Member] \| 2008 Plan [Member] \| First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation	127.00%
2012 [Member] \| Chief Executive Officer [Member] \| 2008 Plan [Member] \| Third Anniversary of Grant Date [Member] [Member] \| Maximum [Member]
Options [Abstract]
option vesting percent, year one	272.00%
2012 [Member] \| Chief Executive Officer [Member] \| 2008 Plan [Member] \| First portion of RSU [Member] \| Third Anniversary of Grant Date [Member] [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years