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REVENUE RECOGNITION AND RECEIVABLES - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2018
--- | --- | --- | ---
Contracts |  |  |
Net deferred tax liabilities | $ 10,675 | $ 8,680 |
Retained earnings | 516,901 | 541,890 |
Minority interest | $ 108,687 | $ 129,961 |
Change | ASU 2014-09 |  |  |
Contracts |  |  |
Contract asset |  |  | $ 1,600
Contract liability |  |  | 200
Contract acquisition costs |  |  | 1,500
Net deferred tax liabilities |  |  | 300
Retained earnings |  |  | 1,500
Minority interest |  |  | 1,100
Change | ASU 2014-09 | Prepayments and other current assets |  |  |
Contracts |  |  |
Contract asset |  |  | 1,200
Contract acquisition costs |  |  | 900
Change | ASU 2014-09 | Other non current assets |  |  |
Contracts |  |  |
Contract asset |  |  | 400
Contract acquisition costs |  |  | $ 600

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