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INCOME TAX - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 31, 2016
May 31, 2015
Deferred income tax assets:          
Basis difference - U.K. business $ 4,890 $ 8,961      
Domestic net operating loss carryforwards 20,096 17,228      
Foreign net operating loss carryforwards 10,833 3,819      
Share-based compensation expense 11,333 7,856      
Accrued expenses 35,913 34,582      
Other 16,906 18,502      
Gross deferred tax assets 99,971 90,948      
Less valuation allowance (23,390) (16,550) $ (16,611) $ (15,119) $ (3,823)
Net deferred tax assets 76,581 74,398      
Deferred tax liabilities:          
Acquired intangibles 522,636 410,563      
Property and equipment 102,654 77,481      
Other 28,188 10,087      
Gross deferred tax liabilities 653,478 498,131      
Net deferred income tax liability $ (576,897) $ (423,733)