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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Deferred compensation $ 2,637 $ 2,393
Other accrued liabilities 1,579 1,964
Interest expense carryforward 11,267  
Net operating loss 154,914 142,950
Other 12,581 15,933
Less valuation allowance on deferred tax assets (45,625) (26,920)
Total deferred tax assets 137,353 136,320
Property, plant and equipment (191,369) (186,561)
Prepaid and other insurance reserves (2,596) (2,561)
Other   (1,985)
Total deferred tax liabilities (193,965) (191,107)
Net deferred tax liabilities $ (56,612) $ (54,787)