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ACCOUNTING POLICIES - New Accounting Standards (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease, liability | $ 71,172 |
Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease, liability | 71,200 | $ 53,200
Operating lease, right-of-use asset | 58,500 | $ 48,900
AOCI Attributable to Parent | Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ (1,100) |

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