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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss and tax credits carryforwards $ 410,456 $ 335,325
Depreciation 45,717 38,532
Deferred revenue 10,913 13,587
Allowance for doubtful accounts 13,552 9,772
Deferred compensation 16,997 20,551
Unrealized loss 3,128 5,395
Nondeductible reserves 24,835 27,062
Interest 32,282 8,630
Operating lease asset 140,500 158,189
Total deferred tax assets 698,380 617,043
Deferred tax liabilities:    
Investment in subsidiaries 71,183 86,906
Amortization of intangible assets 133,091 175,386
Operating lease liability 127,131 148,436
Other 1,918 3,137
Total deferred tax liabilities 333,323 413,865
Net deferred tax assets 365,057 203,178
Valuation allowance for deferred tax assets (320,858) (324,119)
Deferred tax assets, net $ 44,199  
Deferred tax liabilities, net   $ (120,941)