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Equity Investees (Schedule of Operations for Equity Investees) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
INCOME STATEMENT DATA: |  |  |  |
Revenues | $ 30,602 | $ 27,768 | $ 96,041 | $ 83,962
Operating income | 21,745 | 17,772 | 69,705 | 57,444
Net income | $ 19,431 | $ 15,721 | $ 62,576 | $ 51,731

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