Quarterly report pursuant to Section 13 or 15(d)

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

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Notes Payable and Credit Facility (Scheduled Principal Payments Due On West Mifflin Note Payable) (Details) - West Mifflin Note Payable [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Sep. 25, 2015
Debt Instrument [Line Items]      
2019 $ 101    
2020 7,220    
Total $ 7,321 $ 7,356 $ 7,378