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Pension Plans (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Pension Plans (Textual) [Abstract]      
Non-cash curtailment gain   $ 6.3  
Pension liability     6.3
Contribution to pension plan 0.4    
Contributions made by the entity $ 2.2