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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets:    
Stock-based compensation expense $ 32,087 $ 26,893
Federal net operating loss carryforward 7,280 0
State net operating loss carryforward 58,927 65,114
Foreign net operating loss carryforward and other 6,402 6,634
Basis differences in investments 2,590 3,965
Federal benefit of state tax deduction for uncertain tax positions 1,842 2,255
Revenue and expense recognized in different periods for financial reporting and income tax purposes 1,484 3,025
Other assets 2,656 1,584
Total deferred income tax assets 113,268 109,470
Operating Loss Carryforwards [Line Items]    
Net deferred income tax assets 49,469 40,694
Deferred Tax Liabilities:    
Capitalized software currently deductible for tax purposes, net of amortization (57,123) (63,588)
Difference in financial reporting and income tax depreciation methods (9,592) (11,422)
Difference between book and tax basis of other assets (7,179) (5,747)
Goodwill and other intangibles (11,690) (2,462)
Foreign dividend withholding tax 0 0
Capitalized contract costs (8,347) (7,762)
Other liabilities (1,431) (1,900)
Total deferred income tax liabilities (95,362) (92,881)
Net deferred income tax liabilities (45,893) (52,187)
Federal    
Operating Loss Carryforwards [Line Items]    
Less: Net operating loss valuation allowance (1,453) 0
State    
Operating Loss Carryforwards [Line Items]    
Less: Net operating loss valuation allowance (56,004) (62,229)
Foreign    
Operating Loss Carryforwards [Line Items]    
Less: Net operating loss valuation allowance $ (6,342) $ (6,547)