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Statements of Consolidated Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenue from related party	$ 15,458	$ 13,123	$ 12,988
Earnings from unconsolidated companies, tax (benefit)/provision	5,650	1,466	(702)
Discontinued operations, tax (benefit)/provision	$ 0	$ 0	$ 713

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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