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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax liabilities:    
Net deferred tax assets $ 2,197 $ 2,990 [1]
Net deferred tax liabilities 7,728 7,089 [1]
Continuing Operations    
Deferred tax assets:    
Net operating loss carryforwards 152,491 133,504
Tax credit carryforwards 40,931 37,629
Interest expense carryforward 65,141 43,155
Accruals and reserves 36,796 25,589
Deferred compensation 13,262 11,868
Inventories 8,844 8,454
Other 19,119 17,522
Gross deferred tax assets 336,584 277,721
Valuation allowance (244,978) (186,425)
Net deferred tax assets 91,606 91,296
Deferred tax liabilities:    
Property, equipment & intangible assets (70,573) (54,326)
Gain on sale of intellectual property (26,564) (41,069)
Investments 0 0
Other 0 0
Gross deferred tax liabilities: (97,137) (95,395)
Net deferred tax liabilities $ (5,531) $ (4,099)
[1] The consolidated balance sheet as of December 31, 2020 has been revised. For further details refer to “Note 1. Nature of Operations.”