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Equity Investees (Schedule of Operations for Equity Investees) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
INCOME STATEMENT DATA: |  |  |
Revenues | $ 180,056 | $ 191,078 | $ 193,038
Operating Income | 129,160 | 139,604 | 122,836
Net Income | $ 115,669 | $ 134,479 | $ 118,175

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