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FINANCING ARRANGEMENTS - Additional Information (Details) |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 09, 2018 | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 17, 2018 USD ($) | Sep. 30, 2018 USD ($) | Aug. 27, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value |  | $ 527,700,000 |  |  |  |
Long-term debt |  | 1,253,849,000 | $ 1,346,352,000 |  |  |
Line of Credit | Senior Unsecured Revolving Credit Facility 2019 Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 900,000,000 |
Line of Credit | Amended Credit Agreement Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,000,000,000 |  |  |  |
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% |  |  |  |
Unsecured Debt | Amended Credit Agreement Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  | 3.50 |  |  |  |
Unsecured Debt | Senior Notes Due 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value |  | $ 640,900,000 |  |  |  |
Debt instrument, redemption price (percent) | 101.00% |  |  |  |  |
Debt instrument, annual interest rate (percent) | 4.20% |  |  |  |  |
Debt instrument, effective yield (percent) | 4.39% |  |  |  |  |
Long-term debt |  | $ 592,026,000 | 591,608,000 |  |  |
Threshold for holders of principal outstanding to declare principal and unpaid interest payable (percent) | 25.00% |  |  |  |  |
Senior Notes | Note Purchase Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  | 3.00 |  |  |  |
Minimum interest coverage ratio |  | 2.00 |  |  |  |
Debt instrument principal amount |  |  |  |  |  | $ 500,000,000
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] |  |  |  |  |  |
Long-term debt |  | $ 161,823,000 | $ 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 |  |

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