Stock Plans (Details) (USD $)	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
All Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of stock-based compensation plans	5
Number of stock-based compensation plans under which no further awards may be granted (the "EIP")	3
EIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under the plans ( in shares)	12,540,761
Two plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under two plans (in shares)	7,056,403
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected (in years)	2
Restricted shares outstanding [Abstract]
Balance at beginning of period (in shares)	4,440,000
Restricted stock granted (in shares)	1,712,000	1,318,000
Restricted stock vested (in shares)	(974,000)
Restricted stock forfeited (in shares)	(99,000)
Balance at end of period (in shares)	5,079,000
Weighted average fair value of restricted stock per share [Abstract]
Balance at beginning of period	$ 8.29
Restricted stock granted	$ 9.40	$ 7.70
Restricted stock vested	$ 9.84
Restricted stock forfeited	$ 7.81
Balance at end of period	$ 8.38
Balance at beginning of period	$ 43,199,000
Restricted stock granted	13,816,000	9,400,000
Restricted stock vested	7,858,000	5,300,000
Balance at end of period	40,986,000	19,400,000
Remaining unrecognized compensation cost associated with unvested restricted stock awards	33,700,000
Stock Options [Member]
Options Outstanding
Balance at beginning of period (in shares)	1,507,000
Options granted (in shares)	0
Options exercised (in shares)	(10,000)
Options canceled, forfeited or lapsed (in shares)	(543,000)
Balance at end of period (in shares)	954,000
Exercisable at end of period (in shares)	954,000
Weighted average option price per share [Abstract]
Balance at beginning of period	$ 10.50
Options granted	$ 0
Options exercised	$ 8.19
Options canceled, forfeited or lapsed	$ 11.67
Balance at end of period	$ 9.88
Exercisable at end of period	$ 9.88
Weighted average remaining life of options in years [Abstract]
Balance at beginning of period	1.7
Balance at end of period	1.7
Exercisable at end of period	1.7
Balance at beginning of period	603,000
Options exercised	12,000
Balance at end of period	0
Exercisable at end of period	$ 0

The maximum number of shares authorized for issuance under certain deferred compensation arrangement plans as of the balance sheet date.

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Number of stock-based compensation plans under which no further awards may be granted.

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The total fair value of equity-based awards, other than options, for which the grantee received an unvested equity-based award during the reporting period, subject to 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 total fair value of equity-based awards other than options outstanding as of the balance sheet date.

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Total number of stock-based compensation plans under which grants have been made and awards remained outstanding.

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The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date.

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

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

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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 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
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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.

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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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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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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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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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 number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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Number of share options (or share units) exercised during the current period.

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