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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) |

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