XML 55 R38.htm IDEA: XBRL DOCUMENT
v3.10.0.1

EQUITY (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
EQUITY |
Schedule of shares repurchased |
|  |  |  | Aggregate |  |  |  |
|  | Shares |  | Cost |  | Average |
Year ended December 31, |  | Repurchased |  | (in thousands) |  | Repurchase Price |
2018 |  | 30,427 |  | $ | 1,577 |  | $ | 51.82 |
2017 |  | 201,932 |  |  | 10,636 |  |  | 52.67 |
2016 |  | 32,407 |  |  | 2,195 |  |  | 64.72 |
Schedule of repurchases of shares from employees to satisfy tax withholding and stock exercise obligations |
|  |  |  | Aggregate |  |  |  |
|  | Shares |  | Cost |  | Average |
Year ended December 31, |  | Repurchased |  | (in thousands) |  | Repurchase Price |
2018 |  | 141,180 |  | $ | 10,859 |  | $ | 76.76 |
2017 |  | 32,814 |  |  | 2,348 |  |  | 71.54 |
2016 |  | 38,279 |  |  | 2,775 |  |  | 72.50 |
Summary of stock option activity |
|  | Year Ended December 31, 2018 |
|  |  |  |  |  |  | Weighted Average |  |  |  |
|  |  |  | Weighted Avg. |  | Remaining |  |  |  |
|  | Number of |  | Exercise |  | Contractual |  | Aggregate |
|  | Options |  | Price |  | Term (Years) |  | Intrinsic Value |
Outstanding at January 1, 2018 |  | 200,021 |  | $ | 41.76 |  |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |  |
Exercised |  | (158,021) |  |  | 39.95 |  |  |  |  |  |
Outstanding at December 31, 2018 |  | 42,000 |  |  | 48.61 |  | 4.1 |  | $ | 823,515 |
Vested and expected to vest at December 31, 2018 |  | 42,000 |  |  | 48.61 |  | 4.1 |  | $ | 962,840 |
Exercisable at December 31, 2018 |  | 33,250 |  |  | 46.76 |  | 3.0 |  | $ | 823,515 |
|  | Year Ended December 31, 2017 |
|  |  |  |  |  |  | Weighted Average |  |  |  |
|  |  |  |  |  |  | Remaining |  |  |  |
|  | Number of |  | Weighted Avg. |  | Contractual |  | Aggregate |
|  | Options |  | Exercise Price |  | Term (Years) |  | Intrinsic Value |
Outstanding at January 1, 2017 |  | 225,822 |  | $ | 39.77 |  |  |  |  |  |
Granted |  | 10,000 |  |  | 52.97 |  |  |  |  |  |
Exercised |  | (35,801) |  |  | 32.29 |  |  |  |  |  |
Outstanding at December 31, 2017 |  | 200,021 |  |  | 41.76 |  | 3.6 |  | $ | 2,780,253 |
Vested and expected to vest at December 31, 2017 |  | 200,021 |  |  | 41.76 |  | 3.6 |  | $ | 2,780,253 |
Exercisable at December 31, 2017 |  | 187,521 |  |  | 40.77 |  | 3.6 |  | $ | 2,757,353 |
Summary of information relating to options granted and exercised | The following table summarizes information relating to options granted and exercised during the years ended December 31, 2018, 2017 and 2016 (in thousands, except fair value of options granted data):
|  | 2018 |  | 2017 |  | 2016 |
Weighted-average fair value of options granted |  | $ | — |  | $ | 13.77 |  | $ | — |
Aggregate intrinsic value of options exercised |  |  | 5,927 |  |  | 936 |  |  | 1,591 |
Cash proceeds received upon exercise of options |  |  | 72 |  |  | 1,030 |  |  | 649 |
Excess tax benefits from share-based compensation |  |  | — |  |  | — |  |  | 591 |
Schedule of weighted-average assumptions using Black-Scholes option-pricing model for estimating fair value of each option granted |
| 2017 |
Risk-free interest rate | 1.79 | %
Expected dividend yield | 1.28 | %
Expected life | 4.00 | years
Expected volatility | 34.01 | %
Summary of restricted stock activity | The following table summarizes restricted stock activity during the year ended December 31, 2018:
|  |  |  | Weighted Avg. |
|  | Shares |  | Fair Value |
Unvested as of January 1, 2018 |  | 214,938 |  | $ | 68.62 |
Granted |  | 111,474 |  |  | 59.52 |
Forfeited |  | (31,327) |  |  | 66.53 |
Vested and issued |  | (94,432) |  |  | 66.27 |
Unvested as of December 31, 2018 |  | 200,653 |  | $ | 65.21 |
The following table summarizes restricted stock activity during the year ended December 31, 2017:
|  |  |  | Weighted Avg. |
|  | Shares |  | Fair Value |
Unvested as of January 1, 2017 |  | 229,040 |  | $ | 67.13 |
Granted |  | 95,095 |  |  | 68.09 |
Forfeited |  | (12,074) |  |  | 69.71 |
Vested and issued |  | (97,123) |  |  | 64.01 |
Unvested as of December 31, 2017 |  | 214,938 |  | $ | 68.62 |

X
- Definition Tabular disclosure of information pertaining to option granted and exercised during the period under share-based compensation plan. + References No definition available. + Details
Name: | atni_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedAndExercisedTableTextBlock
Namespace Prefix: | atni_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of repurchases of shares from employees to satisfy tax withholding and stock exercise obligations. + References No definition available. + Details
Name: | atni_ScheduleOfSharesRepurchasesToSatisfyTaxWithholdings
Namespace Prefix: | atni_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
Name: | us-gaap_ScheduleOfTreasuryStockByClassTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration