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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jan. 01, 2018
--- | --- | --- | ---
Contracts |  |  |
Contract liability | $ 15,485 | $ 13,787 |
Net deferred tax liabilities | 5,702 | 10,276 |
Retained earnings | 555,806 | 563,593 |
Minority interest | $ 128,858 | $ 127,937 |
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 assets |  |  |
Contracts |  |  |
Contract asset |  |  | 400
Contract acquisition costs |  |  | $ 600

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