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BUSINESS SEGMENTS - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]            
Net sales       $ 769,169 $ 734,902 $ 704,542
Income from operations:       24,970 (23,395) 18,579
Depreciation and amortization       24,664 25,115 23,329
Capital expenditures:       2,082 9,169 7,902
Restructuring expenses       211 1,435 2,324
Assets:   $ 770,023   807,481 770,023  
Goodwill            
Beginning balance $ 49,371     49,371 91,690 15,772
Purchase price adjustment         972  
Impairment       (19,100) (42,990) (2,205)
Foreign currency translation adjustment       0 301 672
Ending balance   49,371   30,271 49,371 91,690
Unallocated corporate expenses            
Segment Reporting Information [Line Items]            
Income from operations:       (22,573) (20,259) (20,239)
Assets:   13,041   35,938 13,041  
U.S.            
Segment Reporting Information [Line Items]            
Net sales       683,539 644,171 609,114
Restructuring expenses         700 2,100
Goodwill            
Beginning balance 49,371     49,371 81,641  
Purchase price adjustment       0 972  
Impairment (19,100) (33,200)   (19,100) (33,242)  
Ending balance   49,371   30,271 49,371 81,641
U.S. | Operating Segments            
Segment Reporting Information [Line Items]            
Net sales       683,539 644,171 609,114
Income from operations:       60,378 19,826 44,213
Depreciation and amortization       20,018 20,653 18,840
Capital expenditures:       1,467 2,078 7,746
Assets:   639,047   661,321 639,047  
International            
Segment Reporting Information [Line Items]            
Restructuring expenses       200 700 200
Goodwill            
Beginning balance $ 0     0 10,049  
Impairment     $ (9,700) 0 (9,748) (2,200)
Foreign currency translation adjustment       0 (301)  
Ending balance   0   0 0 10,049
International | Operating Segments            
Segment Reporting Information [Line Items]            
Net sales       85,630 90,731 95,428
Income from operations:       (12,835) (22,962) (5,395)
Depreciation and amortization       4,646 4,462 4,489
Capital expenditures:       615 7,091 $ 156
Assets:   $ 117,935   $ 110,222 $ 117,935