Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Discontinued operations, tax benefit (expense)	$ (2,062)	$ 2,939	$ 15,926	$ 40,406
Gain on sales of discontinued operations, tax expense (benefit)	$ 3,591	$ 2,694	$ 31,153	$ 18,097

Amount of tax expense (benefit) on gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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