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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Assets:    
Stock-based compensation expense $ 35,865 $ 32,087
Federal net operating loss and R&D Credit carryforward 6,565 7,280
State net operating loss carryforward 40,249 58,927
Foreign net operating loss carryforward and other 7,339 6,402
Accrued expense associated with voluntary separation program 9,792 0
Basis differences in investments 2,432 2,590
Federal benefit of state tax deduction for uncertain tax positions 1,891 1,842
Revenue and expense recognized in different periods for financial reporting and income tax purposes 2,827 1,484
Other assets 4,021 2,656
Total deferred income tax assets 110,981 113,268
Net deferred income tax assets 65,885 49,469
Deferred Tax Liabilities:    
Capitalized research and development (24,764) (57,123)
Difference in financial reporting and income tax depreciation methods (12,694) (9,592)
Difference between book and tax basis of other assets (7,265) (7,179)
Goodwill and other intangibles (7,482) (11,690)
Capitalized contract costs (8,744) (8,347)
Other liabilities 0 (1,431)
Total deferred income tax liabilities (60,949) (95,362)
Net deferred income tax assets 4,936  
Net deferred incom tax liabilities   (45,893)
Federal    
Deferred Tax Assets:    
Less: Net operating loss valuation allowance (794) (1,453)
State    
Deferred Tax Assets:    
Less: Net operating loss valuation allowance (36,963) (56,004)
Foreign    
Deferred Tax Assets:    
Less: Net operating loss valuation allowance $ (7,339) $ (6,342)