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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Contracts      
Net deferred tax liabilities $ 8,680 $ 10,276  
Retained earnings 541,890 563,593  
Minority interest $ 129,961 $ 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