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Equity Method Investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 03, 2016
Feb. 10, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jan. 20, 2010
Schedule of Equity Method Investments [Line Items]                          
Equity method investments     $ 18,546   $ 18,546       $ 19,584        
Capital calls and variable payments         1,083 $ 5,132              
Purchase of membership interest, note payable outstanding     $ 15,690   $ 15,690       $ 15,910        
Subsequent Event | RMC6, LLC (RCM6) | Disposed of by Sale                          
Schedule of Equity Method Investments [Line Items]                          
Ownership interest, percent 24.95%                        
Proceeds from sale of ownership interest, including proceeds to third party $ 1,800                        
Clean Coal Solutions (CCS)                          
Schedule of Equity Method Investments [Line Items]                          
Ownership interest, percent     42.50%   42.50%       42.50%        
Equity method investments     $ 0 $ 0 $ 0 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0  
Clean Coal Solutions Services (CCSS)                          
Schedule of Equity Method Investments [Line Items]                          
Ownership interest, percent                         50.00%
Equity method investments     $ 5,200   $ 5,200       $ 4,100        
Percent of losses removed from net income, attributable to noncontrolling interest     100.00%   100.00%                
RMC6, LLC (RCM6)                          
Schedule of Equity Method Investments [Line Items]                          
Ownership interest, percent   24.95% 24.95%   24.95%       24.95%        
Equity method investments     $ 13,400   $ 13,400       $ 15,400        
Capital calls and variable payments   $ 2,400 850 1,353 1,080 2,736              
Purchase of membership interest, note payable issued   $ 13,300                      
Purchase of membership interest, note payable outstanding     14,400   14,400       $ 14,200        
Earnings (loss) from equity method investment for depreciation and amortization related to investment basis difference     $ 500 $ 1,400 $ 500 $ 1,300