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Income Taxes - Deferred tax (liabilities) assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Temporary differences [Abstract]    
Property and equipment $ (14,493) $ (27,049)
Goodwill and other intangible assets (52,532) (79,610)
Investments, primarily gains and losses not yet recognized for tax purposes 2,792 5,180
Accrued expenses not deductible until paid 7,136 8,700
Deferred compensation and retiree benefits not deductible until paid 61,070 96,910
Other temporary differences, net 3,267 3,835
Total temporary differences 7,240 7,966
Federal and state net operating loss carryforwards 15,455 9,597
Valuation allowance for state deferred tax assets (2,619) (955)
Net deferred tax liability (20,076)  
Deferred Tax Assets, Net $ 20,000 $ 16,608