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Discontinued Operations - income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues									$ 893	$ 24,475
Cost of revenues									(534)	(16,048)
Operating and other expenses									(674)	(7,893)
Gain on disposal of discontinued operations									1,251	0
Income (loss) from discontinued operations before income taxes									936	534
Income tax (benefit) expense									(441)	(617)
Income (loss) from discontinued operations	$ (443)	$ 0	$ 34	$ 1,786	$ 1,010	$ 228	$ 236	$ (323)	$ 1,377	$ 1,151

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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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