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Income Taxes - Net deferred tax assets (liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets        
Compensation and benefits $ 13,208 $ 14,036    
Share-based compensation 2,682 7,446    
Pension and other postretirement benefits 24,260 22,285    
Inventories 15,379 11,505    
R&D capitalization 12,925 6,449    
Lease liability 9,669      
Partnership investment 223 110    
Transaction costs 1,365 1,580    
Nondeductible accruals and reserves 6,907 7,248    
Miscellaneous 2,802 2,379    
Net operating loss and other tax carryforwards 74,586 80,671    
Gross deferred tax assets 164,006 153,709    
Valuation allowance (18,424) (15,542) $ (25,579) $ (21,726)
Total deferred tax assets 145,582 138,167    
Deferred tax liabilities        
Property, plant and equipment (6,687) (8,057)    
Identifiable intangible assets (62,349) (54,681)    
Right-of-use assets (9,407)      
Foreign exchange derivative instruments (154) (1,176)    
Miscellaneous (1,281) (860)    
Total deferred tax liabilities (79,878) (64,774)    
Net deferred tax asset $ 65,704 $ 73,393