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Credit Facilities - Additional Information (Details) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Mar. 28, 2014
Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity $ 74,000,000   $ 72,500,000
Credit facility available to repay outstanding preferred share and previous line of credit     40,000,000
Direct financing costs     1,675,000
Credit facility maturity date Mar. 28, 2019    
Line of credit $ 56,500,000    
Unamortized debt discount 730,000    
Letters of credit outstanding 3,530,000    
Credit facility remaining borrowing capacity $ 13,927,000    
Weighted average interest rate on outstanding borrowing 4.40%    
Capitalized interest expense on property plant and equipment $ 80,000 $ 1,057,000  
Facility termination date Nov. 09, 2016    
Letter of Credit      
Line Of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 5,000,000