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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Operating income | $ 14,372 | $ 12,639 | $ 33,201 | $ 19,207
Net income attributable to Sterling common stockholders | 8,915 | 7,132 | 19,580 | 8,537
Variable Interest Entity, Primary Beneficiary |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues | 56,816 | 64,266 | 142,786 | 126,333
Operating income | 2,488 | 3,666 | 5,227 | 6,307
Net income attributable to Sterling common stockholders | $ 1,245 | $ 1,834 | $ 2,615 | $ 3,149

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