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Investments (Details) (Keymark Enterprises, LLC, USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
Mar. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Keymark Enterprises, LLC
     
Equity Method Investment      
Equity method investment ownership percentage (as a percent)     40.60%
Increase (decrease) in equity method investment (as a percent) 5.50%    
Equity method investment ownership percentage after all transactions (as a percent)   46.10%  
Remaining balance, loan and pledge agreement defaulted on by the other owner of Keymark   $ 0.7