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Income Taxes Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets: |  |
Stock-based compensation expense | $ 26,893 | $ 24,686
State net operating loss carryforward | 65,114 | 67,472
Foreign net operating loss carryforward and other | 6,634 | 6,081
Basis differences in investments | 3,965 | 4,436
Federal benefit of state tax deduction for uncertain tax positions | 2,255 | 2,124
Revenue and expense recognized in different periods for financial reporting and income tax purposes | 3,025 | 1,960
Other assets | 1,584 | 1,271
Total deferred income tax assets | 109,470 | 108,030
Operating Loss Carryforwards [Line Items] |  |
Net deferred income tax assets | 40,694 | 37,299
Deferred Tax Liabilities: |  |
Capitalized software currently deductible for tax purposes, net of amortization | (63,588) | (68,265)
Difference in financial reporting and income tax depreciation methods | (11,422) | (6,032)
Difference between book and tax basis of other assets | (5,747) | (4,593)
Goodwill and other intangibles | (2,462) | (2,170)
Foreign dividend withholding tax | 0 | (312)
Capitalized contract costs | (7,762) | (7,072)
Other liabilities | (1,900) | (1,755)
Total deferred income tax liabilities | (92,881) | (90,199)
Net deferred income tax liabilities | (52,187) | (52,900)
State |  |
Operating Loss Carryforwards [Line Items] |  |
Less: Net operating loss valuation allowance | (62,229) | (64,737)
Foreign |  |
Operating Loss Carryforwards [Line Items] |  |
Less: Net operating loss valuation allowance | $ (6,547) | $ (5,994)

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