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NEW ACCOUNTING STANDARDS (NARRATIVE) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Retained earnings | $ 773,218 |  | $ 725,551 |
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] | true |  |  |
Revenue, Practical Expedient, Financing Component [true false] | true |  |  |
Operating Lease, Right-of-Use Asset | $ 150,808 | $ 129,894 |  |
Operating Lease, Liability |  | 148,300 |  |
Lease, Practical Expedients, Package [true false] | true |  |  |
Lease, Practical Expedient, Use of Hindsight [true false] | false |  |  |
Lease, Practical Expedient, Lessor Single Lease Component [true false] | true |  |  |
Deferred revenue - current | $ 39,447 |  | $ 44,926 |
ASU 2016-02 |  |  |  |
Retained earnings |  | $ 800 |  | $ 10,000

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