Stock Awards (Restricted Equity Awards Activity) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Vesting Based On Service [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested awards at beginning of the year, Shares	783,305	962,350
Awarded, Shares	292,803	277,680
Vested, Shares	(453,980)	(454,323)
Forfeited, Shares	(18,148)	(2,402)
Nonvested awards at end of year, Shares	603,980	783,305
Nonvested awards at beginning of the year, Weighted Average Value at Award Date	$ 10.43	$ 10.22
Awarded, Weighted Average Value at Award Date	$ 10.76	$ 10.39
Vested, Weighted Average Value at Award Date	$ 9.89	$ 9.97
Forfeited, Weighted Average Value at Award Date	$ 9.70	$ 8.66
Nonvested awards at end of year, Weighted Average Value at Award Date	$ 11.02	$ 10.43
Vesting Based On Market/Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested awards at beginning of the year, Shares	828,409	1,301,088
Awarded, Shares	853,656	182,600
Vested, Shares	(163,575)	(175,279)
Forfeited, Shares	(7,093)	(480,000)
Nonvested awards at end of year, Shares	1,511,397	828,409
Nonvested awards at beginning of the year, Weighted Average Value at Award Date	$ 8.70	$ 6.90
Awarded, Weighted Average Value at Award Date	$ 5.72	$ 9.25
Vested, Weighted Average Value at Award Date	$ 6.87	$ 10.64
Forfeited, Weighted Average Value at Award Date	$ 9.32	$ 3.31
Nonvested awards at end of year, Weighted Average Value at Award Date	$ 7.21	$ 8.70

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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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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- Definition

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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- Definition

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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