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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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