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Income Taxes - Deferred Tax and Liabilities Arising from Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Receivables $ 19,705 $ 25,197
Accrued liabilities 96,537 224,712
Net operating loss carryforwards 108,429 128,813
Other 37,794 73,525
Deferred tax assets 262,465 452,247
Valuation allowance (61,282) (56,016)
Net deferred tax assets 201,183 396,231
Intangible assets (501,763) (676,781)
Property and equipment (100,376) (141,919)
Investments in partnerships (61,529) (95,936)
Other (23,762) (12,464)
Deferred tax liabilities (687,430) (927,100)
Net deferred tax liabilities $ (486,247) $ (530,869)