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Discontinued Operations - Carrying Value of Major Classes of Assets and Liabilities for MBP Titan (Details) - Discontinued Operations, Disposed of by Means Other than Sale, Abandonment - MBP Titan - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Property, plant and equipment, net	$ 586	$ 17,017
Goodwill	0	9,635
Right-of-use assets	9,131	13,425
Other assets	136	636
Total assets held for sale or abandonment	9,853	40,713
Liabilities
Lease liabilities, current	1,890	1,548
Other current liabilities	619	1,657
Lease liabilities, net of current portion	11,538	13,730
Total liabilities held for sale or abandonment	$ 14,047	$ 16,935

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