Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details 3)

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Commitments and Contingencies (Details 3) (Note payable at an interest rate of 2.2%, USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2013
Mar. 31, 2012
Note payable at an interest rate of 2.2%
       
Commitments and Contingencies        
Outstanding balance     $ 0.2 $ 0.3
Interest rate (as a percent)     2.20% 2.20%
Expense upon renewal of insurance contracts $ 0.5 $ 0.6