Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Other Share-Based Compensation and Benefit Plans) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2012
Restricted Stock [Member]
Other employee benefit plan descriptions	a performance incentive plan, which provides for the award of shares of restricted stock to its corporate and senior management that vest evenly over a three-year period and are held in escrow until such vesting has occurred, and a compensation plan, which provides for the award of shares of restricted stock to the Company's independent directors that vest evenly over a three-year period and are held in escrow until such vesting has occurred. Compensation expense recognized under these plans is measured based on the closing market price of the Company's common stock on the date of award and is recorded evenly over the vesting period.
Employee Stock Purchase Plan [Member]
Employee stock purchase plan stock purchase percentage	85.00%
Other employee benefit plan descriptions	an employee stock purchase plan (the "ESPP"), which permits all eligible employees to purchase shares of the Company's common stock at 85% of the fair market value.  Compensation expense recognized under these plans is measured based on the closing market price of the Company's common stock on the date of award and is recorded evenly over the vesting period.