COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Details) - Office Space Purchase Commitment $ in Thousands	3 Months Ended
	Sep. 30, 2019 USD ($)
Belarus
Other Commitments [Line Items]
Total commitment amount	$ 22,680
Ukraine
Other Commitments [Line Items]
Total commitment amount	48,900
Other noncurrent assets | Belarus
Other Commitments [Line Items]
Amount paid	1,000
Other noncurrent assets | Ukraine
Other Commitments [Line Items]
Amount paid	$ 12,000