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Commitments and Contingencies - Partnership Distributions (Details) - USD ($)
12 Months Ended 40 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Noncontrolling Interest [Line Items]          
Ownership percentage by noncontrolling owners 50.00%       50.00%
Percentage of partnership interests distributable at company's discretion 100.00%       100.00%
Navitus          
Noncontrolling Interest [Line Items]          
Ownership percentage by noncontrolling owners 50.00%       50.00%
Noncontrolling interest, preferred return distribution, percentage 10.00%        
Warrant conversion ratio, per unit acquired 50,000        
Warrant issuance ratio per $1.00 invested 1        
Capital contributions         $ 7,332,900
Navitus | Common Stock          
Noncontrolling Interest [Line Items]          
Warrants issued as a result of capital contributions $ 2,917,000 $ 1,140,000 $ 2,186,000 $ 1,089,900 $ 7,332,900