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DEBT AND FINANCING ARRANGEMENTS - Debt terms (Details) - USD ($) $ in Thousands | Dec. 10, 2019 | Jun. 19, 2019 | Dec. 06, 2017 | Mar. 13, 2014 | Mar. 23, 2010
--- | --- | --- | --- | --- | ---
Senior Notes | 5.875% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal |  |  |  |  | $ 500,000
Issue Price |  |  |  |  | 99.624%
Net Proceeds |  |  |  |  | $ 495,000
Interest rate |  |  |  |  | 5.875%
Senior Notes | 5.150% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal |  |  |  | $ 250,000 |
Issue Price |  |  |  | 99.474% |
Net Proceeds |  |  |  | $ 246,000 |
Interest rate |  |  |  | 5.15% |
Senior Notes | 4.000% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal |  |  | $ 350,000 |  |
Issue Price |  |  | 99.78% |  |
Net Proceeds |  |  | $ 347,000 |  |
Interest rate |  |  | 4.00% |  |
Senior Notes | 3.900% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal |  | $ 300,000 |  |  |
Issue Price |  | 99.36% |  |  |
Net Proceeds |  | $ 296,000 |  |  |
Interest rate |  | 3.90% |  |  |
Junior Subordinated Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal | $ 425,000 |  |  |  |
Issue Price | 99.00% |  |  |  |
Net Proceeds | $ 420,750 |  |  |  |
Interest rate | 4.90% |  |  |  |
Junior Subordinated Notes | Five-Year Treasury Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 3.186% |  |  |  |

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