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Investments in and advances to unconsolidated joint ventures - Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Revenues $ 42,287 $ 32,013
Cost of Sales and Expenses 41,774 31,209
Net income of unconsolidated joint ventures 513 804
Equity in net income of unconsolidated joint ventures reflected in the accompanying condensed consolidated statements of operations $ 184 $ 335