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)

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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, 2018
Dec. 31, 2017
Sep. 25, 2015
Debt Instrument [Line Items]      
2018 $ 136    
2019 7,220    
Total $ 7,356 $ 7,378 $ 7,378