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SEGMENT AND GEOGRAPHICAL REPORTING - Reconciliation of Operating Income to Consolidated Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Operating income for reportable segments, excluding adjustments $ 101,520 $ 131,408 $ 134,501
Adjustments for:      
Amortization of intangibles 12,287 15,074 16,586
Impairment and other charges 59,883 0 0
Total operating income (27,668) 67,412 72,086
Interest expense 20,571 19,498 20,937
Other expense (income), net 74 (45) (1,192)
Income (loss) before income taxes (48,313) 47,959 52,341
Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Operating income for reportable segments, excluding adjustments 101,520 131,408 134,501
Segment Reconciling Items      
Adjustments for:      
Amortization of intangibles 12,287 15,074 16,586
Impairment and other charges 59,883 0 0
Corporate      
Adjustments for:      
Corporate and other expense, net $ 57,018 $ 48,922 $ 45,829