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Note 7 - Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities:    
Net book value of property and equipment $ 18,131 $ 26,620
Broadcast licenses, goodwill and other intangibles 272,330 369,275
Total deferred tax liabilities 290,461 395,895
Deferred tax assets:    
Liability for accrued vacation 1,438 2,232
Liability for accrued bonus 2,391 5,483
Loan acquisition costs 47 336
Allowance for doubtful accounts 1,170 1,168
Liability under health and welfare plan 608 1,201
Liability for pension plan 9,611 13,278
Federal operating loss carryforwards 0 20,401
State and local operating loss carryforwards 4,719 4,555
Alternative minimum tax carryforwards 3,925 386
Unearned income 2 3
Stock options 113 174
Acquisition costs 2,104 3,140
Restricted stock 2,636 1,950
Other 82 109
Total deferred tax assets 28,846 54,416
Valuation allowance for deferred tax assets (75) (1,532)
Net deferred tax assets 28,771 52,884
Deferred tax liabilities, net of deferred tax assets $ 261,690 $ 343,011