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Stock based compensation and retirement plans.

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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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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).

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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).

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

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Stock-Based Compensation and Retirement Plans (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Option expires, years	In 10 years
Compensation expense		$ 4,700,000
Proceed from issue of shares under employee stock purchase plans	1,223,000	1,054,000
Non Qualified Stock Option [Member]
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Issuance Of Non-Qualified Stock Options		1,019,000
Option vested, Period	Over 3 years
Compensation expense	1,700,000	2,300,000
Restricted Stock [Member]
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		177,000
Option vested, Period	Over 3 years
Compensation expense	2,800,000	3,300,000
Restricted Stock Units [Member]
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Option vested, Period	Within 30 days
Compensation expense	600,000	700,000
Performance Share Units [Member]
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		30,000
Compensation expense	2,400,000	4,300,000
Performance period of PSU grant, years	3
Performance measures for participants	If the participant has met specified continued service requirements, the PSUs will settle in cash or a combination of cash and up to 50% of equivalent value in the Company’s common stock, at the discretion of the compensation committee
Current liability	3,500,000		6,000,000
Long-term liability	6,300,000		7,000,000
Amount paid to employees for settlement	2,800,000	6,400,000
Issue of common stock to employees	67,300
Employee Stock Purchase Plan [Member]
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Compensation expense	200,000	200,000
Common stock reserved for issuance	1,250,000
Proceed from issue of shares under employee stock purchase plans	1,200,000	1,100,000
Issue of shares under employee stock purchase plans	38,000	57,000
Supplemental Employee Retirement Plans [Member]
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Compensation expense	$ 900,000	$ 5,200,000
Deferred Compensation [Member]
Stock Based Compensation and Retirement Plans (Textuals) [Abstract]
Employee Deferral to Non-Qualified Deferred Compensation Plan	up to 75% of their base salary, up to 100% of their bonus, and up to 100% of the cash portion of their PSU compensation to the plan
Non Employee Deferral To Non-Qualified Deferred Compensation Plan	Defer up to 100% of their cash compensation paid by the Company to the plan. Additionally, participating directors may defer up to 100% of the shares of common stock.