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SEGMENT REPORTING - Reconciliation of Operating Income to Consolidated Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Operating income for reportable segments $ 32,839 $ 22,138 $ 92,837 $ 79,619
Adjustment for:        
Amortization of intangible assets 4,238 3,053 12,690 9,296
Impairment and other charges 0 48,401 0 48,401
Corporate expenses 17,416 11,530 47,883 44,311
Income from operations 11,185 (40,846) 32,264 (22,389)
Interest expense 5,264 3,752 15,844 12,059
Other (income) expense, net (450) 320 (985) (381)
Income (loss) before income taxes $ 6,371 $ (44,918) $ 17,405 $ (34,067)