Discontinued Operations (Financial Information) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
Jan. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax		$ (6,581)	$ 1,208	$ (7,811)	$ 9,695
Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale	$ (18,000)
DMT \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		0	89,201	0	191,435
Earnings (loss) from discontinued operations		0	8,278	(663)	21,620
Loss on sale		(8,589)	(7,238)	(9,257)	(8,777)
(Loss) income from discontinued operations before taxes		(8,589)	1,040	(9,920)	12,843
Tax (benefit) provision		(2,008)	(168)	(2,109)	3,148
(Loss) income from discontinued operations, net of tax		$ (6,581)	$ 1,208	$ (7,811)	$ 9,695

Discontinued Operation, Earnings From Discontinued Operation, Before Income Tax

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

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