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Segment and Related Information (Tables)
12 Months Ended
Dec. 31, 2018
Segment and Related Information Disclosure [Abstract]  
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
Long-lived assets by geographic area consist of the following:
December 31,
20182017
(in thousands)
United States$42,222$3,800
Germany5,0225,793
United Kingdom585966
Rest of the world2,6013,214
Long-lived assets held for sale-6,327
Total long-lived assets (1)$50,430$20,100
(1) Total long-lived assets consists of property, plant and equipment, net and amortizable intangible assets, net.
Net Assets By Geographic Area [Table Text Block]
Net assets by geographic area consist of the following:
December 31,
20182017
(in thousands)
United States$38,921$15,502
Germany17,26118,354
United Kingdom10,47314,376
Rest of the world16,06917,472
Net assets held for sale-15,196
Total net assets$82,724$80,900