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RESTATEMENT - Impact of Restatement Adjustment on Consolidated Cash Flows Statements (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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:                              
Net income (loss) $ (3,200) $ (34,800) $ 2,400 $ 6,000 $ 1,300 $ 13,800 $ 14,000 $ 7,600 $ 12,300 $ 8,800 $ 11,900 $ 5,200 $ (29,617) $ 36,765 $ 38,234
Reconciliation of net income (loss) to net cash provided by operating activities:                              
Deferred income taxes                         (14,732) 840 1,004
Changes in operating assets and liabilities                              
Trade accounts receivable                         44,884 7,898 (24,999)
Inventories                         22,414 (13,910) (21,363)
Prepaid expenses and other assets                         13,782 5,110 187
Accounts payable and accrued expenses                         (15,345) (19,003) 7,418
Other long-term liabilities                         (8,853) (6,718) 2,610
Net cash provided by operating activities                         109,650 41,306 35,840
CASH FLOWS FROM INVESTING ACTIVITIES:                              
Acquisition of businesses, net of cash acquired                         (115,247) 0 (10,811)
Net cash used in investing activities                         (121,796) (22,085) (17,576)
As Reported                              
CASH FLOWS FROM OPERATING ACTIVITIES:                              
Net income (loss) $ (2,000) $ (34,700) $ 2,100 $ 5,700 $ 2,100 $ 13,200 $ 13,400 $ 7,300 $ 11,100 $ 8,400 $ 11,600 $ 4,500 (29,074) 35,775 35,521
Reconciliation of net income (loss) to net cash provided by operating activities:                              
Deferred income taxes                         (14,771) 1,110 1,004
Changes in operating assets and liabilities                              
Trade accounts receivable                         42,909 5,560 (22,487)
Inventories                         22,208 (14,447) (20,838)
Prepaid expenses and other assets                         13,053 5,110 188
Accounts payable and accrued expenses                         (14,897) (15,408) 7,093
Other long-term liabilities                         (8,870) (6,718) 2,610
Net cash provided by operating activities                         $ 107,675 $ 41,306 $ 35,840