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FINANCING ARRANGEMENTS - Narrative (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 17, 2018 USD ($) | Apr. 09, 2018 | Aug. 27, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Carrying value | $ 1,235,333,000 | $ 1,346,352,000 |  |  |
Line of Credit | Amended Credit Agreement due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 1,000,000,000 |  |  |  |
Maximum leverage ratio | 3.50 |  |  |  |
Line of Credit | Amended Credit Agreement due 2023 | Federal Funds Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 0.50% |  |  |  |
Line of Credit | Amended Credit Agreement due 2023 | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 1.13% |  |  |  |
Line of Credit | Amended Credit Agreement due 2023 | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee (percent) | 0.075% |  |  |  |
Line of Credit | Amended Credit Agreement due 2023 | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee (percent) | 0.20% |  |  |  |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt fair value | $ 539,300,000 |  |  |  |
Senior Notes | Note Purchase Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum leverage ratio | 3.00 |  |  |  |
Debt instrument principal amount |  |  |  |  | $ 500,000,000
Minimum interest coverage ratio | 2.00 |  |  |  |
Maximum priority debt to total assets ratio (percent) | 15.00% |  |  |  |
Debt instrument, redemption price (percent) | 100.00% |  |  |  |
Secured Debt | Receivables securitization facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying value | $ 142,885,000 | 249,744,000 |  |  |
Secured Debt | Receivables securitization facility | Wells Fargo Bank N.A. and Bank of America N.A. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 250,000,000 |  |
Unsecured Debt | Senior Notes Due 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt fair value | $ 659,900,000 |  |  |  |
Debt instrument, redemption price (percent) | 101.00% |  |  |  |
Debt instrument annual interest rate (percent) |  |  |  | 4.20% |
Debt Instrument effective yield (percent) |  |  |  | 4.39% |
Carrying value | $ 592,448,000 | $ 591,608,000 |  |  |
Threshold for holders of principal outstanding to declare principal and unpaid interest payable (percent) | 25.00% |  |  |  |

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