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Equity Method Investments - Activity Related to Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity Method Investments        
Balance at beginning of period     $ 103,517 $ 68,029
Contributions     18,171 10,114
Earnings (loss) on equity method investments $ (73) $ 1,512 1,935 2,933
Balance at end of period $ 123,623 81,076 $ 123,623 81,076
Constitution        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage 25.00%   25.00%  
Equity Method Investments        
Balance at beginning of period     $ 90,345 64,268
Contributions     6,800 6,000
Earnings (loss) on equity method investments     1,937 2,955
Balance at end of period $ 99,082 73,223 99,082 73,223
Contributions to date $ 86,400   $ 86,400  
Meade        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage 20.00%   20.00%  
Equity Method Investments        
Balance at beginning of period     $ 13,172 3,761
Contributions     11,371 4,114
Earnings (loss) on equity method investments     (2) (22)
Balance at end of period $ 24,541 $ 7,853 24,541 $ 7,853
Investment Commitment | Constitution        
Equity Method Investments        
Anticipated contributions 240,000   240,000  
Minimum | Investment Commitment        
Equity Method Investments        
Expected future contributions 30,000   30,000  
Maximum | Investment Commitment        
Equity Method Investments        
Expected future contributions $ 35,000   $ 35,000