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QUARTERLY FINANCIAL DATA (UNAUDITED) (NARRATIVE) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (decrease) in contingent consideration payable $ (2,500)   $ 1,100 $ 3,300     $ 2,400        
(Gain) Loss on dissolution of subsidiary     17,400 2,500         $ (19,905) $ 0 $ 0
Other nonoperating income expense                 (18,591) 3,902 (11,618)
Interest Expense.                 17,489 19,113 28,674
Tax contingent liabilities 600 $ 1,900 200 200 $ 200 $ 200 100 $ 200 600 200  
Income (Loss) from Subsidiaries, Tax Expense (Benefit)   3,000                  
Benefit (expense) to Income Taxes, acquisition earnouts 400   300 (900)              
Benefit to Income Taxes Related to Amortization of Purchased Intangibles 1,100 1,000 1,000 1,100 700 700 700 800      
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount     (200) (300)     200 700      
Net Change in Valuation Allowance 1,000   900 300 2,200   2,300        
Tax Adjustments, Settlements, and Unusual Provisions 2,300   400 100 1,600 200 100 100      
Decrease (increase) - change in tax rate         2,800       (48) (2,848) $ (1,944)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses 4,064       4,142       $ 4,064 $ 4,142  
Excess tax benefit from equity-based awards 800 $ 1,200 1,000 1,000 800 1,500 1,200 1,200      
Net change in income tax other reconciling items $ 100   $ 100 100 100 200 100 100      
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent                 22.50% 24.40%  
Trademarks [Member]                      
(Gain) Loss on dissolution of subsidiary           (700)          
Recovery of Receivables [Member]                      
Other nonoperating income expense           1,400          
Motif [Member]                      
Interest Expense.       $ 6,200 $ 2,100 $ 800 $ 500 $ 1,300