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Property, Plant, and Equipment and Assets Held For Sale - Assets Held For Sale (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) building	Dec. 31, 2015 USD ($)
Assets held for sale
Asset impairment charges	$ 1,139	$ 69,520	$ 126
Assets held for sale	0	$ 0
South Korea
Assets held for sale
Number of facilities listed for sale \| building		2
Asset impairment charges		$ 4,500
St. Paul, Minnesota
Assets held for sale
Asset impairment charges	$ 700	1,200
Lab equipment
Assets held for sale
Non-cash impairment charges		$ 6,200