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Share-Based Compensation (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Full Value Awards [Member]
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2013
Time-Based Restricted Stock Units (RSUs) [Member]
Sep. 30, 2012
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Apr. 04, 2013
Chief Executive Officer [Member]
Restricted Stock [Member]
Apr. 04, 2013
Chief Executive Officer [Member]
Time-Based Restricted Stock Units (RSUs) [Member]
Apr. 04, 2013
Chief Executive Officer [Member]
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Mar. 30, 2012
Chief Executive Officer [Member]
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Chief Executive Officer [Member]
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Modified to time based             $ 53.05 [1]            
Expected Term                         6 years
Share-based Compensation, Historical volatility period                         12 years
Share-based Compensation, Grants in Period           62,137   103,239 19,084     103,239  
Share-based Compensation, Grant Date Fair Value                   $ 0.5 $ 0.4    
Share-based Compensation, Fair Value Assumptions, Exercise Price                   $ 53.05      
Share-based Compensation, Number of Shares Available for Grant 28,355   28,355   9,711                
Document Period End Date     Sep. 30, 2013                    
Share-based Compensation, Vesting, Number of Annual Installments                       7 years  
Share-Based Compensation (Textuals) [Abstract]                          
Allocated Share-based Compensation Expense 2.5 2.4 7.2 6.2                  
Share-based Compensation Capitalized 0.2 0.2 0.6 0.7                  
Share-based Compensation, Unrecognized costs $ 27.9   $ 27.9                    
Share-based Compensation, Unrecognized costs, weighted-average vesting period     2 years 4 months                    
[1] During the second quarter the terms of time-based RSUs granted to certain officers of the Company in January were modified to include market-measure based vesting requirements.