Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Construction and Term Loans (Details)

v3.10.0.1
Long-Term Debt - Construction and Term Loans (Details)
 1 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
Dec. 31, 2018
USD ($)
Financial_institutions
Oct. 31, 2018
USD ($)
Aug. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Long-term debt value, carrying value   $ 253,873,000       $ 202,168,000
Number of project financing debt facilities Company was not in compliance with | Financial_institutions   2        
Number of project financing debt facilities Company was not in compliance with that waived failure | Financial_institutions   1        
Number of project financing debt facilities Company was not in compliance with that did not waive failure | Financial_institutions   1        
Covenant failure fee on a project financing facility   $ 3,978,000        
Term loan | Variable rate term loan payable in quarterly installments            
Debt Instrument [Line Items]            
Long-term debt value, carrying value   $ 21,475,000       0
Debt interest rate   10.297%        
Term loan | Seven Point Five Percent Term Loan Due In August 2022            
Debt Instrument [Line Items]            
Draws on line of credit $ 28,500,000          
Term loan | Five Point One Five Percent Term Loan Due December 2038            
Debt Instrument [Line Items]            
Long-term debt value, carrying value   $ 30,069,000       0
Debt interest rate   5.15%        
Stated interest rate       5.15%    
Original principal amount       $ 31,659,000 $ 12,407,000  
Term loan | Variable Rate Term Loan Due In June 2033            
Debt Instrument [Line Items]            
Long-term debt value, carrying value   $ 9,668,000       0
Debt interest rate   4.847%        
Original principal amount         $ 10,000,000  
Term loan | Variable Rate Term Loan Due In September 2029            
Debt Instrument [Line Items]            
Long-term debt value, carrying value   $ 9,072,000       $ 0
Debt interest rate   5.02% 2.50%      
Original principal amount     $ 9,200      
Term Loan - Joinder Agreement | Five Point One Five Percent Term Loan Due December 2038            
Debt Instrument [Line Items]            
Original principal amount       $ 19,252,000    
London Interbank Offered Rate (LIBOR) | Term loan | Seven Point Five Percent Term Loan Due In August 2022            
Debt Instrument [Line Items]            
Basis spread on variable rate 7.50%