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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Foreign tax credit carryforwards $ 19,836 $ 27,009
Net operating loss carryforwards 50,737 12,692
Employee benefits 12,583 12,013
Inventory reserves 6,065 5,546
Other reserves 3,219 1,653
Allowance for doubtful accounts 1,072 1,332
Other 197 299
Gross deferred tax asset 93,709 60,544
Valuation allowance (33,762) (37,904)
Net deferred tax asset 59,947 22,640
Deferred tax liabilities:    
Tax over book depreciation (46,942) (31,535)
Intangible assets (57,867) (14,153)
Convertible senior notes discount (6,569) 0
Accrued liabilities (1,085) (856)
Other (554) (295)
Deferred tax liability (113,017) (46,839)
Net deferred tax liability(1) $ (53,070) $ (24,199)