Represents the ratio for distribution of stock awards in the form of shares of the company's common stock.

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- Definition

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

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- Definition

Represents the percentage of stock awards granted during the period that are subject to the degree to which specified total shareholder return conditions are required to be satisfied before awards vest.

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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.

+ References

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- Definition

The maximum 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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- Definition

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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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

+ Details

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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

+ Details

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(a)
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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.

+ References

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-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (e)(1)
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Stock Incentive Plans (Details 2) (USD $)	6 Months Ended			12 Months Ended
Stock Incentive Plans (Details 2) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Stock Awards	Dec. 31, 2010 Stock Awards
Stock Incentive Plans
Total compensation expense related to stock incentive plans	$ 8,700,000	$ 9,300,000
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period, low end of the range (in years)			3 years
Award vesting period, high end of the range (in years)			6 years
Stock awards unit activity
Outstanding units at the beginning of the period (in shares)			3,158,335
Units Granted (in shares)			285,791
Units Paid (in shares)			(307,149)
Units Canceled (in shares)			(148,793)
Outstanding units at the end of the period (in shares)			2,988,184	3,158,335
Outstanding awards, aggregate intrinsic value			100,941,000	103,053,000
Stock award distribution ratio			one for one basis
Portion of stock awards granted that are subject to total shareholder return conditions (as a percent)			47.00%	18.00%
Unrecorded compensation cost			$ 41,200,000
Weighted average remaining contractual life of outstanding stock awards (in years)			2.5