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Income Taxes (Components of Net Deferred Income Tax Assets and Net Deferred Income Tax Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax assets:    
Intangibles $ 20,624 $ 22,530
Stock options and restricted stock awards 6,065 5,916
Reserves and allowances 11,959 15,656
Net operating loss carryforwards 57,782 41,356
Tax credit carryforwards 12,749 13,669
Accrued liabilities 3,218 3,040
Deferred revenue 3,940 5,036
Lease Tax Asset 5,970 0
163(j) Limitation Carryforward 1,519 0
Valuation allowance (109,643) (95,398)
Total deferred income tax assets 14,183 11,805
Deferred income tax liabilities:    
Intangibles 4,495 6,994
Property, plant and equipment 3,282 5,265
Lease Tax Liability 4,195 0
Liabilities related to distributions 0 997
Other 830 522
Total deferred income tax liabilities 12,802 13,778
Net deferred income tax liabilities   $ (1,973)
Net deferred income tax asset $ 1,381