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Consolidated 50% Owned Subsidiaries Consolidated 50% Owned Subsidiaries - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Variable Interest Entity [Line Items] |  |
Operating income | $ 12,103 | $ 4,720
Net income | 3,115 | 1,815
Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Revenues | 44,362 | 42,414
Operating income | 155 | 277
Net income | $ 158 | $ 282

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