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Equity Income in Unconsolidated Investment (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Noncontrolling Interest [Line Items]      
Equity gain (loss) from Standard Steam $ 0 $ (25,000)  
Standard Steam Trust LLC [Member]
     
Noncontrolling Interest [Line Items]      
Ownership percentage (in hundredths) 19.54%    
Impairment of equity investment     2,200,000
Equity gain (loss) from Standard Steam $ 0 $ (25,000)