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Income Taxes - Deferred tax (liabilities) assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Temporary differences [Abstract]    
Property and equipment $ (31,003) $ (33,802)
Goodwill and other intangible assets (119,074) (100,841)
Investments, primarily gains and losses not yet recognized for tax purposes (2,989)  
Investments, primarily gains and losses not yet recognized for tax purposes   3,176
Accrued expenses not deductible until paid 7,748 7,694
Deferred compensation and retiree benefits not deductible until paid 46,242 54,258
Operating lease right-of-use assets (12,480) (31,039)
Operating lease liabilities 12,089 32,632
Interest limitation carryforward 0 12,527
Other temporary differences, net 966 3,422
Total temporary differences (98,501) (51,973)
Federal and state net operating loss carryforwards 15,532 51,308
Valuation allowance for state deferred tax assets (2,875) (4,905)
Net deferred tax liability $ (85,844) $ (5,570)