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FINANCING ARRANGEMENTS (Narrative) (Details) |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 17, 2019 USD ($) | Jul. 02, 2019 USD ($) | Aug. 01, 2018 USD ($) | Jul. 19, 2018 USD ($) | Apr. 17, 2018 | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  | $ 6,100,000 |  | $ 2,500,000 | $ 6,131,000 | $ 2,488,000 | $ 7,891,000
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 | 1,600,000,000 |
Borrowing from revolving credit facility |  |  |  |  |  |  |  |  | 0 | 50,000,000 | 0
Settlement of borrowing |  |  |  |  |  |  |  |  | 0 | 50,000,000 | $ 0
Revolving credit facility, available borrowing capacity |  |  |  |  |  |  | 235,400,000 |  | 229,200,000 | 235,400,000 |
Letters of credit outstanding, amount |  |  |  |  |  |  | 130,100,000 |  | 146,900,000 | 130,100,000 |
Derivative liability |  |  |  |  |  |  | 8,800,000 |  | $ 20,800,000 | 8,800,000 |
Senior secured Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 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% |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 4.875% |  |
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% |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.125% |  |
Unsecured debt | Unsecured senior notes, at 5.125%, due June 1, 2021 (2021 Notes) |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.125% |  |
Repurchased amount | $ 144,000,000.0 | 701,000,000.0 |  |  |  |  |  |  |  |  |
Repayments of debt |  | 706,200,000 |  |  |  |  |  |  |  |  |
Accrued interest | $ 900,000 | $ 3,100,000 |  |  |  |  |  |  |  |  |
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Repurchased amount |  |  | $ 78,000,000.0 | $ 322,000,000.0 |  |  |  |  |  |  |
Secured debt | Senior secured Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.55% |  |
Secured debt | Senior secured Term Loan Agreement | Base rate |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 0.75% |  |  |  |  |  |
Reduction of applicable interest rate margin |  |  |  |  | 0.0025 |  |  |  |  |  |
Secured debt | Senior secured Term Loan Agreement | Eurodollar |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.75% |  |  |  |  |  |
Reduction of applicable interest rate margin |  |  |  |  | 0.0025 |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  | 0.25% |  |
LIne of credit | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 1.25% |  |
LIne of credit | Maximum |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  |  |  |  | 0.30% |  |
LIne of credit | Maximum | Base rate |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 0.50% |  |
LIne of credit | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 1.50% |  |
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% |  |
Senior notes | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Redemption of 2020 notes |  |  | 78,000,000.0 |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 2.92% |  |
Notional amount |  |  |  |  |  |  | 350,000,000.0 |  |  | 350,000,000.0 |
Revolving credit facility | LIne of credit |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Borrowing from revolving credit facility |  |  | $ 50,000,000.0 |  |  |  |  |  |  |  |
Settlement of borrowing |  |  |  |  |  |  | 50,000,000.0 |  |  |  |
Debt outstanding |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 0 |
Revolving credit facility | LIne of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | 300,000,000.0 |  |
Revolving credit facility | LIne of credit | Canadian Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | 100,000,000.0 |  |
Letters of credit | LIne of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | 250,000,000.0 |  |
Letters of credit | LIne of credit | Canadian Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 75,000,000.0 |  |

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