Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Narratives (Details)

v3.8.0.1
Financial Instruments - Narratives (Details)
1 Months Ended 9 Months Ended
Jul. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
MMBTU
Derivative [Line Items]    
Derivative, notional quantity (in MMBTU) | MMBTU   690,000
Amount of derivative loss expected to be transfered from OCI   $ 241,000
Interest rate caps    
Derivative [Line Items]    
Premium paid to acquire derivative instrument $ 1,551,000  
Derivative, notional amount $ 1,000,000  
Interest rate caps | Minimum    
Derivative [Line Items]    
Derivative, cap interest rate 1.50%  
Interest rate caps | Maximum    
Derivative [Line Items]    
Derivative, cap interest rate 3.00%