Annual report pursuant to Section 13 and 15(d)

Notes Payable and Revolving Credit Facility (Scheduled Principal Payments Due On West Mifflin Note Payable) (Details)

v3.8.0.1
Notes Payable and Revolving Credit Facility (Scheduled Principal Payments Due On West Mifflin Note Payable) (Details) - West Mifflin Note Payable [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 $ 22  
2019 136  
2020 7,220  
Total $ 7,378 $ 7,378