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Income Taxes (Tax Effect Of Significant Temporary Differences Representing Deferred Tax Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Liabilities, Net [Abstract]    
Difference in financial reporting and income tax depreciation methods $ (2,695) $ (3,637)
Reserves not currently deductible 245 209
Capitalized software currently deductible for tax purposes, net of amortization (111,174) (118,841)
State deferred income tax asset 1,444 0
State deferred income tax liability 0 (420)
Revenue and expense recognized in different periods for financial reporting and income tax purpose 5,534 6,212
Unrealized holding loss on investments 772 0
Unrealized holding gain on investments 0 (475)
Stock-based compensation expense (34,739) (38,989)
State net operating loss carryforward 19,580 24,150
Valuation allowance on deferred tax assets (14,548) (16,509)
Federal benefit of state tax deduction for uncertain tax positions 3,014 2,913
Foreign tax credit 0 2,327
Foreign deferred tax assets 61 0
Foreign deferred including taxes on cumulative undistributed earnings of SEI AK 0 (87)
Net deferred income tax liability $ (63,028) $ (65,169)