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Equity Investees (Schedule of Operations for Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
INCOME STATEMENT DATA:
Revenues	$ 539,923	$ 620,009
Operating income	59,162	62,029
Net income	24,909	15,954
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Poseidon
INCOME STATEMENT DATA:
Revenues	32,892	31,052
Operating income	23,606	22,305
Net income	$ 21,583	$ 19,850

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