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Equity Method Investments - Narrative (Details) - USD ($)
2 Months Ended 3 Months Ended 6 Months Ended
Mar. 03, 2016
Mar. 03, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Feb. 10, 2014
Jan. 20, 2010
Schedule of Equity Method Investments [Line Items]                        
Equity method investments     $ 2,739,000   $ 2,739,000     $ 3,959,000        
Earnings from equity method investments     10,155,000 $ 13,754,000 23,969,000 $ 19,331,000            
Gain on sale of equity method investment     $ 0 $ 0 $ 0 $ 2,078,000            
RMC6, LLC (RCM6) | Disposed of by Sale                        
Schedule of Equity Method Investments [Line Items]                        
Ownership interest, percent 24.95% 24.95%                    
Proceeds from sale of ownership interest, including proceeds to third party $ 1,800,000                      
Tinuum Group, LLC                        
Schedule of Equity Method Investments [Line Items]                        
Ownership interest, percent     42.50% 42.50% 42.50% 42.50%            
Temporary equity     $ 11,500,000   $ 11,500,000     18,300,000        
Equity method investments     0 $ 0 0 $ 0 $ 0 $ 0 $ 2,043,000 $ 0    
Earnings from equity method investments     $ 9,138,000 12,832,000 $ 22,313,000 18,275,000            
Ownership interest multiplied by net income available to members, percent     42.50%   42.50%              
RMC6, LLC (RCM6)                        
Schedule of Equity Method Investments [Line Items]                        
Ownership interest, percent 24.95% 24.95%           24.95%     24.95%  
Earnings from equity method investments   $ (557,000) $ 0 0 $ 0 (557,000)            
Gain on sale of equity method investment         2,100,000              
Tinuum Services, LLC                        
Schedule of Equity Method Investments [Line Items]                        
Ownership interest, percent                       50.00%
Equity method investments     2,700,000   2,700,000     $ 4,000,000        
Earnings from equity method investments     $ 1,017,000 $ 922,000 $ 1,656,000 $ 1,613,000            
Percent of losses removed from net income, attributable to noncontrolling interest     100.00%   100.00%