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INCOME TAX - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
May 31, 2016
May 31, 2015
May 31, 2014
Deferred income tax assets:          
Basis difference - U.K. business $ 8,961 $ 11,145      
Domestic net operating loss carryforwards 17,228 12,723      
Foreign income tax credit carryforwards 0 7,140      
Foreign net operating loss carryforwards 3,819 2,559      
Share-based compensation expense 7,856 11,656      
Accrued expenses 34,582 54,030      
Other 18,502 9,101      
Deferred tax assets, gross 90,948 108,354      
Less valuation allowance (16,550) (16,611) $ (15,119) $ (3,823) $ (7,199)
Net deferred tax asset 74,398 91,743      
Deferred tax liabilities:          
Acquired intangibles 410,563 663,922      
Property and equipment 77,481 86,548      
Other 10,087 1,956      
Deferred tax liabilities, gross 498,131 752,426      
Net deferred income tax liability $ (423,733) $ (660,683)