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Other Events and Transactions (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Entity Information [Line Items]
Other (income) expense	$ 2,958	$ 111	$ 4,525	$ (851)
Other, net	1,258	(8)	1,236	18
Interest income	1,878	$ 94	$ 3,012	$ 326
NACC India's Customer | NACC India
Entity Information [Line Items]
Other (income) expense	2,700
Other, net	1,400
Interest income	$ 1,300

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