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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") Consolidated 50% Owned Subsidiaries, including Variable Interest Entities - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Operating income | $ 12,150 | $ 8,356 | $ 18,828 | $ 6,568
Net income attributable to Sterling common stockholders | 8,176 | 3,662 | 10,663 | 1,405
Variable Interest Entity, Primary Beneficiary |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues | 45,795 | 38,783 | 85,970 | 62,067
Operating income | 1,632 | 2,246 | 2,740 | 2,640
Net income attributable to Sterling common stockholders | $ 816 | $ 1,121 | $ 1,370 | $ 1,316

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