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Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2013
Performance Shares [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2013
Stock Appreciation Rights (SARs) [Member]
Jun. 30, 2013
Director [Member]
Jun. 30, 2013
Director [Member]
Stock Options [Member]
Jun. 30, 2013
Director [Member]
Restricted Stock [Member]
Jun. 30, 2013
Chief Executive Officer [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation Expense   $ 1.3 $ 0.2 $ 0.9          
Vesting Period         3 years        
SSARS Expiration Date P10Y                
Unrecognized compensation costs   $ 4.6           $ 3.3 $ 1.0
Weighted-average period of years costs are expected to be recognied over   1 year 4 months 24 days           1 year 6 months 2 years 9 months 18 days
Number of months for options to vest at an incremental rate of ten percent for directors             3 months    
Starting Term When Options Become Exercisable After Grant Date           3 months