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SEGMENT REPORTING - Reconciliation of Operating Income to Consolidated Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Operating income for reportable segments $ 25,386 $ 31,109
Adjustment for:    
Amortization of intangible assets 4,146 3,197
Income from operations 6,212 10,915
Interest expense 5,243 4,377
Other (income) expense, net (430) (834)
Income before income taxes 1,399 7,372
Operating Segments    
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Operating income for reportable segments 25,386 31,109
Segment Reconciling Items    
Adjustment for:    
Amortization of intangible assets 4,146 3,197
Impairment and other charges 0 0
Corporate    
Adjustment for:    
Corporate expenses $ 15,028 $ 16,997