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FINANCING ARRANGEMENTS - Narrative (Details) |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 17, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 03, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 27, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 1,725,950,000 | $ 1,725,950,000 |  | $ 1,093,301,000 |
Revolving credit facility | Line of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,000,000,000 | $ 1,000,000,000 |  |  |
Maximum leverage ratio |  | 3.50 | 3.50 |  |  |
Long-term debt |  | $ 632,000,000 | $ 632,000,000 |  | 0 |
Revolving credit facility | Line of credit | Federal Funds Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.50% |  |  |
Revolving credit facility | Line of credit | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.13% |  |  |
Revolving credit facility | Line of credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee (percent) |  |  | 0.075% |  |  |
Revolving credit facility | Line of credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee (percent) |  |  | 0.20% |  |  |
Combinex credit facility | Line of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 3,600,000 |  |
Repayment on credit facility |  | 2,200,000 |  |  |  |
US Bank | Line of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | 15,000,000 | $ 15,000,000 |  |  |
US Bank | Standby letters of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit utilized for standby letters of credit related to insurance collateral |  | $ 8,000,000 | $ 8,000,000 |  |  |
Note Purchase Agreement | Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  | 3.00 | 3.00 |  |  |
Minimum interest coverage ratio |  |  | 2.00 |  |  |
Debt instrument principal amount |  |  |  |  |  | $ 500,000,000
Long-term debt, fair value |  | $ 546,000,000 | $ 546,000,000 |  |  |
Maximum priority debt to total assets ratio (percent) |  |  | 15.00% |  |  |
Debt instrument, redemption price (percent) |  |  | 100.00% |  |  |
Senior Notes Due 2028 | Unsecured debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value |  | $ 680,200,000 | $ 680,200,000 |  |  |
Debt instrument, redemption price (percent) |  |  | 101.00% |  |  |
Debt instrument, annual interest rate (percent) |  | 4.20% | 4.20% |  |  |
Long-term debt |  | $ 593,950,000 | $ 593,950,000 |  | $ 593,301,000 |
Debt instrument, effective yield (percent) |  | 4.39% | 4.39% |  |  |
Threshold for holders of principal outstanding to declare principal and unpaid interest payable (percent) |  |  | 25.00% |  |  |
Receivables securitization facility | Secured debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 250,000,000 |  |  |  |  |
Receivables securitization facility | Secured debt | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) | 0.65% |  |  |  |  |

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