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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets:    
Stock-based compensation expense $ 35,999 $ 35,865
Federal net operating loss and R&D Credit carryforward 5,477 6,565
State net operating loss carryforward 39,820 40,249
Foreign net operating loss carryforward and other 7,486 7,339
Capitalized research and development 11,759 0
Accrued expense associated with voluntary separation program 3,796 9,792
Basis differences in investments 5,111 2,432
Federal benefit of state tax deduction for uncertain tax positions 2,039 1,891
Revenue and expense recognized in different periods for financial reporting and income tax purposes 2,306 2,827
Other assets 2,509 4,021
Total deferred income tax assets 116,302 110,981
Net deferred income tax assets 71,056 65,885
Deferred Tax Liabilities:    
Capitalized research and development 0 (24,764)
Difference in financial reporting and income tax depreciation methods (9,679) (12,694)
Difference between book and tax basis of other assets (7,652) (7,265)
Goodwill and other intangibles (6,784) (7,482)
Capitalized contract costs (9,232) (8,744)
Total deferred income tax liabilities (33,347) (60,949)
Net deferred income tax assets 37,709 4,936
Federal    
Deferred Tax Assets:    
Less: Net operating loss valuation allowance (794) (794)
State    
Deferred Tax Assets:    
Less: Net operating loss valuation allowance (36,966) (36,963)
Foreign    
Deferred Tax Assets:    
Less: Net operating loss valuation allowance $ (7,486) $ (7,339)