REVENUE RECOGNITION - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Contract Assets and Liabilities
Retail revenue period for billing postpaid customers in advance		1 month
Contract asset, current	$ 2,148	$ 2,148	$ 1,900
Change in contract asset - current		$ 248
% of change in contract asset - current		13.00%
Contract asset, noncurrent	703	$ 703	802
Change in contract Asset - noncurrent		$ (99)
% of change in contract Asset - noncurrent		(12.00%)
Contract liabilities	(17,729)	$ (17,729)	(13,787)
Change in contract liabilities		$ (3,942)
% of change in contract liabilities		(29.00%)
Net contract liability	(14,878)	$ (14,878)	$ (11,085)
Change in net contract liability		$ (3,793)
% of change in net contract liability		(34.00%)
Revenue recognized related to contract liability		$ 11,200
Amortization of contract assets	400	1,500
Revenue recognized in the period related to performance obligations that were satisfied or partially satisfied in previous periods	$ 11,200	$ 11,200

Represents the amortization of contract assets into revenue.

No definition available.

Name:	atni_AmortizationOfContractAssetsIntoRevenue
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in revenue recognized for current cumulative catch-up adjustment from the timing of customer prepayments and contract billings which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

No definition available.