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Income Taxes Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Deferred Tax Assets And Liabilities [Abstract] |  |
Stock-based compensation expense | $ 24,725 | $ 33,459
Foreign and state net operating loss carryforward | 71,236 | 20,049
Basis differences in investments | 4,191 | 6,165
Federal benefit of state tax deduction for uncertain tax positions | 1,918 | 3,647
Revenue and expense recognized in different periods for financial reporting and income tax purposes | 2,631 | 5,022
Other assets | 273 | 813
Total deferred income tax assets | 104,974 | 69,155
Less: valuation allowance | (68,469) | (17,922)
Net deferred income tax assets | 36,505 | 51,233
Capitalized software currently deductible for tax purposes, net of amortization | (70,575) | (107,897)
Difference in financial reporting and income tax depreciation methods | (3,182) | (5,190)
Difference between book and tax basis of other assets | (3,549) | (4,597)
Goodwill and other intangibles | (1,001) | 0
Foreign Dividend Withholding Tax | (3,199) | 0
Other liabilities | (704) | (1,115)
Total deferred income tax liabilities | (82,210) | (118,799)
Net deferred income tax liabilities | $ (45,705) | $ (67,566)

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