Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation And Cash-Based Incentive Compensation (Schedule of stock activity related to share-based compensation) (Details)

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Share-Based Compensation And Cash-Based Incentive Compensation (Schedule of stock activity related to share-based compensation) (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Restricted Stock [Member]
Mar. 31, 2012
Restricted Stock [Member]
Mar. 31, 2012
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2014
Scenario, Forecast [Member]
Restricted Stock [Member]
Dec. 31, 2013
Scenario, Forecast [Member]
Restricted Stock [Member]
Dec. 31, 2012
Scenario, Forecast [Member]
Restricted Stock [Member]
Dec. 31, 2013
Scenario, Forecast [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
Scenario, Forecast [Member]
Restricted Stock Units (RSUs) [Member]
30803 - Disclosure - Share-Based And Cash-Based Incentive Compensation [Line Items]                
Shares, Outstanding restricted stock, December 31, 2011   51,870 [1] 1,732,703          
Weighted Average Grant Date Fair Value Per Share, Outstanding restricted shares, December 31, 2011   $ 15.81 [1] $ 14.67          
Weighted Average Grant Date Fair Value Per Share, Granted $ 15.81              
Shares, Forfeited     (20,984)          
Weighted Average Grant Date Fair Value Per Share, Forfeited     $ 26.93          
Shares, Outstanding restricted stock, March 31, 2012 51,870 51,870 [1] 1,711,719 [2]          
Weighted Average Grant Date Fair Value Per Share, Outstanding restricted shares, March 31, 2012   $ 15.81 [1] $ 14.52 [2]          
Restricted stock units expected to vest       5,034 16,699 30,137 503,005 1,208,714
[1] Subject to the satisfaction of service conditions, 30,137 shares, 16,699 shares and 5,034 shares will vest in 2012, 2013 and 2014, respectively.
[2] Subject to the satisfaction of service conditions, 1,208,714 and 503,005 RSUs will vest in 2012 and 2013, respectively.