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Long-Term Incentive Awards - Additional Information (Details) (2004 Amended and Restated Long-Term Incentive Plan, USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant or award, 2004 Long Term Incentive Plan, as amended	4.5
Time-based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period - share settled awards	1/3 per year
Annual vesting percentage	33.00%
Time-based Restricted Stock Awards \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Time-based restricted stock awards granted (in shares)	0.6
Weighted-average grant date fair value, Granted (in dollars per share)	$ 6.79

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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- Definition

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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