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Income Taxes - Significant Components To Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets:    
Accrued liabilities and other adjustments $ 53,197 $ 59,477
Net operating loss carryforwards 99,240 92,952
Federal benefit of unrecognized tax benefits 3,039 2,925
Valuation allowance (60,003) (55,666)
Deferred tax assets 95,473 99,688
Deferred Tax Liabilities:    
Other assets, principally due to differences in amortization (177,645) (166,469)
Plant and equipment, principally due to differences in depreciation (67,515) (74,147)
Other (21,903) (26,260)
Deferred tax liabilities (267,063) (266,876)
Net deferred tax liability $ (171,590) $ (167,188)