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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
May 02, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to unvested awards $ 27.4   $ 27.4    
Unrecognized compensation cost, expected to be capitalized 4.5   4.5    
Weighted average years over which this cost will be recognized     10 months 24 days    
Percentage Of Performance Based Shares Received Estimated Target Amount     100.00%    
Increase in stock compensation expense due to the restricted stock awards granted     $ 4.3    
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 13,768 21,128 452,110 469,677  
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