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FINANCING ARRANGEMENTS (Narrative) (Details) - USD ($) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2020 | Mar. 31, 2020 | Jul. 02, 2019 | Jul. 19, 2018 | Apr. 17, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 01, 2018
Financing arrangements |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  | $ 0 | $ 6,131,000 | $ 2,488,000 |
Effective interest rate (as a percent) |  |  |  |  |  | 4.67% |  |  |
Fair value of long-term obligations, including current portion |  |  |  |  |  | $ 1,600,000,000 | 1,600,000,000 |  |
Borrowings from revolving credit facility |  |  |  |  |  | 150,000,000 | 0 | 50,000,000 |
Revolving credit facility, available borrowing capacity |  |  |  |  |  | 264,000,000.0 |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | 120,600,000 |  |  |
Derivative liability |  |  |  |  |  | $ 33,600,000 | 20,800,000 |  |
Secured senior Term Loans due June 30, 2024 |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Term loan outstanding |  |  |  | $ 350,000,000.0 |  |  |  |  |
Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | 330,900,000 |  |  |  |  |
Accrued interest |  |  |  | 7,900,000 |  |  |  |  |
Debt redemption fees |  |  |  | 1,000,000.0 |  |  |  |  |
Term Loans with Interest Rate Swap Agreements |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | 350,000,000.0 |
Unsecured debt |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  |  | 100.00% |  |  |
Debt instrument, redemption price, percentage of principal amount redeemed |  |  |  |  |  | 35.00% |  |  |
Unsecured debt | Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes") |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 545,000,000.0 |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  |  | 104.875% |  |  |
Unsecured debt | Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes") |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | 300,000,000.0 |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  |  | 105.125% |  |  |
Unsecured debt | Unsecured senior notes, at 5.125%, due June 1, 2021 ("2021 Notes") |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Repurchased amount |  |  | 845,000,000.0 |  |  |  |  |  |
Repayments of debt |  |  | 850,200,000 |  |  |  |  |  |
Accrued interest |  |  | $ 4,000,000.0 |  |  |  |  |  |
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Repurchased amount |  |  |  | $ 322,000,000.0 |  |  |  |  | $ 78,000,000.0
Secured debt | Secured senior Term Loans due June 30, 2024 |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  | 1.90% |  |  |
Secured debt | Secured senior Term Loans due June 30, 2024 | Eurodollar |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.75% |  |  |  |
Secured debt | Secured senior Term Loans due June 30, 2024 | Base rate |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 0.75% |  |  |  |
LIne of credit |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 400,000,000.0 |  |  |
Period for measurement of average liquidity (in days) |  |  |  |  |  | 30 days |  |  |
LIne of credit | Minimum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  | 0.25% |  |  |
LIne of credit | Minimum | Base rate |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 0.50% |  |  |
LIne of credit | Minimum | LIBOR |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 1.50% |  |  |
LIne of credit | Maximum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  | 0.375% |  |  |
LIne of credit | Maximum | Base rate |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 0.75% |  |  |
LIne of credit | Maximum | LIBOR |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 1.75% |  |  |
LIne of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable (as a percent) | 85.00% |  |  |  |  |  |  |  |
Credit available subject to percentage of cash deposited (as a percent) | 100.00% |  |  |  |  |  |  |  |
LIne of credit | Canadian Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable (as a percent) | 85.00% |  |  |  |  |  |  |  |
Credit available subject to percentage of cash deposited (as a percent) | 100.00% |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 2.92% |  |  |
Notional amount |  |  |  |  |  |  |  | $ 350,000,000.0 |
Revolving credit facility | LIne of credit |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Borrowings from revolving credit facility |  | $ 150,000,000.0 |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  | $ 0 | $ 0 |  |
Revolving credit facility | LIne of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 350,000,000.0 |  |  |  |  |  |  |  |
Revolving credit facility | LIne of credit | Canadian Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | 50,000,000.0 |  |  |  |  |  |  |  |
Letters of credit | LIne of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 250,000,000.0 |  |  |  |  |  |  |  |

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