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Equity Investees (Schedule of Operations for Equity Investees) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
INCOME STATEMENT DATA: |  |  |  |
Revenues | $ 27,768 | $ 30,597 | $ 83,962 | $ 88,003
Operating income | 17,772 | 22,334 | 57,444 | 63,159
Net income | $ 15,721 | $ 20,739 | $ 51,731 | $ 58,754

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