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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
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)