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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
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)