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Equity Investments (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2014
Apr. 30, 2014
Feb. 19, 2013
Feb. 29, 2008
Co-venturer | TKK            
Equity Investments            
Shipment amount     $ 5.6      
Good faith payment     $ 0.3      
Eco Emission Enterprise Srl            
Equity Investments            
Equity method investment ownership percentage         50.00%  
Equity method investments       $ 0.1    
TC Catalyst, Inc.            
Equity Investments            
Equity method investment ownership percentage           50.00%
Percentage of ownership after transaction 5.00% 30.00%