Shared-Based Payments (Summary of the Company's Employee Restricted Stock Shares, Restrcited Stock Units and Performance Shares) (Parenthetical)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Number of shares to be awarded at the end of each performance period, lower limit	0.00%	0.00%
Number of shares to be awarded at the end of each performance period, upper limit	150.00%	150.00%