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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Allowance for doubtful accounts $ 77 $ 158
Inventory 316 2,048
Deferred compensation 2,393 4,003
Other accrued liabilities 1,964 3,024
Net operating loss 142,950 150,277
Other 15,540 18,337
Less valuation allowance on deferred tax assets (26,920) (13,128)
Total deferred tax assets 136,320 164,719
Property, plant and equipment (186,561) (249,714)
Prepaid and other insurance reserves (2,561) (4,603)
Other (1,985) (4,233)
Total deferred tax liabilities (191,107) (258,550)
Net deferred tax liabilities $ (54,787) $ (93,831)