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Income Taxes - Significant Components To Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets:    
Accrued liabilities and other adjustments $ 54,506 $ 38,931
Net operating loss carryforwards 92,952 105,026
Federal benefit of unrecognized tax benefits 2,925 3,051
Valuation allowance (55,666) (61,756)
Deferred tax assets 94,717 85,252
Deferred Tax Liabilities:    
Other assets, principally due to differences in amortization (166,469) (168,028)
Plant and equipment principally due to differences in depreciation (74,147) (61,530)
Other (26,260) 0
Deferred tax liabilities (266,876) (229,558)
Net deferred tax liability $ (172,159) $ (144,306)