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Statements of Condensed Consolidated Operations (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Earnings from unconsolidated companies, tax provision	$ 1,807	$ 1,355	$ 2,053	$ 2,231
Discontinued operations, tax (benefit)/provision	0	0	0	0
Related party revenue	$ 4,486	$ 3,609	$ 6,843	$ 6,306

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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