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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign currency translations (Details)	12 Months Ended
	Dec. 31, 2018 Rp / RM Rp / ¥ Rp / € Rp / $ Rp / $	Dec. 31, 2017 Rp / RM Rp / ¥ Rp / € Rp / $ Rp / $
Foreign currency translations
Customer relationship term	23 years
Buy | USD
Foreign currency translations
Foreign currency translations	14,375	13,565
Buy | Australian dollar
Foreign currency translations
Foreign currency translations	10,157	10,592
Buy | Euro
Foreign currency translations
Foreign currency translations | Rp / €	16,432	16,231
Buy | Yen
Foreign currency translations
Foreign currency translations | Rp / ¥	130.56	120.48
Buy | Malaysian ringgits
Foreign currency translations
Foreign currency translations | Rp / RM	3,474	3,349
Sell | USD
Foreign currency translations
Foreign currency translations	14,385	13,570
Sell | Australian dollar
Foreign currency translations
Foreign currency translations	10,167	10,598
Sell | Euro
Foreign currency translations
Foreign currency translations | Rp / €	16,446	16,242
Sell | Yen
Foreign currency translations
Foreign currency translations | Rp / ¥	130.70	120.55
Sell | Malaysian ringgits
Foreign currency translations
Foreign currency translations | Rp / RM	3,480	3,355

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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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