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INCOME TAXES - Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Inventories $ 1,470 $ 1,844
Restricted stock and stock options 3,862 4,097
Lease liabilities 1,641 1,456
Currency and interest rate swap 2,831 442
Other 3,308 3,935
Total deferred tax assets 13,112 11,774
Deferred tax liabilities:    
Amortization 32,872 28,589
Depreciation 27,897 37,075
Prepaid expenses 915 465
Right of use assets 1,926 1,461
Other 731 584
Total deferred tax liabilities 64,341 68,174
Valuation allowance 130 31
Net deferred tax liability $ 51,359 $ 56,431