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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 33,679 | $ 49,846
Tax credit carryforwards | 88,147 | 92,368
Property, plant and equipment | 21,387 | 15,328
Deferred interest expense | 476 | 0
Accrued liabilities | 37,832 | 39,929
Receivable | 30,086 | 29,178
Unrealized foreign exchange loss | 7,205 | 8,018
Revenue recognition | 0 | 1,564
Operating lease liabilities | 16,053 | 26,955
Other | 15,219 | 14,665
Total deferred tax assets | 250,084 | 277,851
Valuation allowance | (114,811) | (101,869)
Total deferred tax assets net of valuation allowance | 135,273 | 175,982
Property, plant and equipment | 34,206 | 50,215
Deferred gain | 5,739 | 7,839
Unrealized foreign exchange gain | 3,129 | 5,242
Unbilled receivables | 8,995 | 822
Operating lease right of use assets | 16,031 | 26,241
Other | 5,533 | 7,433
Total deferred tax liabilities | 73,633 | 97,792
Other assets | 73,585 | 86,616
Other non-current liabilities | (11,945) | (8,426)
Net deferred tax assets | $ 61,640 | $ 78,190

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