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Income Taxes Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Deferred Tax Assets And Liabilities [Abstract] |  |
Stock-based compensation expense | $ 33,459 | $ 34,739
Foreign and state net operating loss carryforward | 20,049 | 19,580
Basis differences in investments | 6,165 | 6,439
Federal benefit of state tax deduction for uncertain tax positions | 3,647 | 3,014
Revenue and expense recognized in different periods for financial reporting and income tax purposes | 5,022 | 4,675
Other assets | 813 | 1,793
Total deferred income tax assets | 69,155 | 70,240
Less: valuation allowance | 17,922 | 14,548
Net deferred income tax assets | 51,233 | 55,692
Capitalized software currently deductible for tax purposes, net of amortization | 107,897 | 111,174
Difference in financial reporting and income tax depreciation methods | 5,190 | 2,695
Difference between book and tax basis of other assets | (4,597) | (4,294)
Other liabilities | (1,115) | (557)
Total deferred income tax liabilities | (118,799) | (118,720)
Net deferred income tax liabilities | $ (67,566) | $ (63,028)

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