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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
May 02, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to unvested awards $ 22.0   $ 22.0    
Unrecognized compensation cost, expected to be capitalized 3.6   3.6    
Weighted average years over which this cost will be recognized     9 months 18 days    
Percentage Of Performance Based Shares Received Estimated Target Amount     100.00%    
Increase in stock compensation expense due to the restricted stock awards granted     $ 7.6    
Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance percentage criteria     0.00%    
Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance percentage criteria     150.00%    
Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized         3,300,000
Shares granted 0 0 452,110 469,677  
Performance Shares [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards granted in period, percent     40.00% 30.00%  
Performance Shares [Member] | First Half Of 2017 [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     71,674    
Performance Shares [Member] | First Half Of 2016 [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted       57,405