ATN International (ATNI) 10-Q 4 Nov 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 04, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-12593
Entity Registrant Name	ATN INTERNATIONAL, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-0728886
Entity Address, Address Line One	500 Cummings Center, Suite 2450
Entity Address, City or Town	Beverly
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01915
City Area Code	978
Local Phone Number	619-1300
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	ATNI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		15,898,477
Entity Central Index Key	0000879585
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 135,153	$ 161,287
Restricted cash	1,072	1,071
Short-term investments	403	416
Accounts receivable, net of allowances for credit losses of $12.2 million and $12.7 million, respectively	43,471	35,904
Inventory, materials and supplies	5,127	5,253
Prepayments and other current assets	40,358	24,792
Total current assets	225,584	228,723
Fixed Assets:
Property, plant and equipment	1,297,519	1,237,555
Less accumulated depreciation	(708,091)	(631,974)
Net fixed assets	589,428	605,581
Telecommunication licenses, net	114,083	93,686
Goodwill	60,691	60,691
Customer relationships, net	6,266	7,441
Operating lease right-of-use assets	64,294	68,763
Other assets	53,068	65,841
Total assets	1,113,414	1,130,726
Current Liabilities:
Current portion of long-term debt	3,750	3,750
Accounts payable and accrued liabilities	82,961	74,093
Dividends payable	2,725	2,721
Accrued taxes	7,921	8,517
Current portion of operating lease liabilities	10,902	11,406
Advance payments and deposits	24,603	19,182
Total current liabilities	132,862	119,669
Deferred income taxes	2,602	8,680
Operating lease liabilities, excluding current portion	53,543	56,164
Other liabilities	49,836	57,454
Long-term debt, excluding current portion	79,973	82,676
Total liabilities	318,816	324,643
Commitments and contingencies (Note 13)
ATN International, Inc. Stockholders' Equity:
Preferred stock, $0.01 par value per share; 10,000,000 shares authorized, none issued and outstanding
Common stock, $0.01 par value per share; 50,000,000 shares authorized; 17,383,898 and 17,324,858 shares issued, respectively, 15,898,477 and 16,001,937 shares outstanding, respectively	172	172
Treasury stock, at cost; 1,485,421 and 1,322,921 shares, respectively	(59,456)	(51,129)
Additional paid-in capital	191,578	188,471
Retained earnings	540,119	541,890
Accumulated other comprehensive income	(4,538)	(3,282)
Total ATN International, Inc. stockholders' equity	667,875	676,122
Non-controlling interests	126,723	129,961
Total equity	794,598	806,083
Total liabilities and equity	$ 1,113,414	$ 1,130,726

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowances (in dollars)	$ 12.2	$ 12.7
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	17,383,898	17,324,858
Common stock, shares outstanding	15,898,477	16,001,937
Treasury stock, shares	1,485,421	1,322,921

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUE:
Total Revenue	$ 111,739	$ 115,616	$ 331,743	$ 326,637
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Termination and access fees	26,979	27,622	83,562	83,440
Engineering and operations	18,127	20,095	53,983	58,234
Sales, marketing and customer service	9,344	9,785	28,220	29,048
General and administrative	25,735	25,110	75,413	75,518
Transaction-related charges	31	21	147	89
Depreciation and amortization	21,580	22,603	66,089	64,870
(Gain) loss on disposition of long-lived assets	(4)	132	60	321
Total operating expenses	102,182	105,368	307,864	311,520
Income from operations	9,557	10,248	23,879	15,117
OTHER INCOME (EXPENSE)
Interest income	118	414	427	1,860
Interest expense	(1,361)	(1,298)	(4,091)	(3,843)
Other income (expense)	(2,031)	(2,686)	(4,341)	(2,755)
Other income (expense), net	(3,274)	(3,570)	(8,005)	(4,738)
INCOME BEFORE INCOME TAXES	6,283	6,678	15,874	10,379
Income tax provisions	92	1,834	(1,057)	2,774
NET INCOME	6,191	4,844	16,931	7,605
Net income attributable to non-controlling interests, net of tax expense of $0.2 million, $0.4 million, $0.8 million, $1.2 million, respectively.	(3,530)	(3,459)	(10,538)	(8,657)
NET INCOME (LOSS) ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS	$ 2,661	$ 1,385	$ 6,393	$ (1,052)
NET INCOME (LOSS) PER WEIGHTED AVERAGE SHARE ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS:
Basic (in dollars per share)	$ 0.17	$ 0.09	$ 0.40	$ (0.07)
Diluted (in dollars per share)	$ 0.17	$ 0.09	$ 0.40	$ (0.07)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	15,962	16,000	15,946	15,984
Diluted (in shares)	16,011	16,007	15,990	15,984
DIVIDENDS PER SHARE APPLICABLE TO COMMON STOCK (in dollars per share)	$ 0.17	$ 0.17	$ 0.51	$ 0.51
Communication services
REVENUE:
Total Revenue	$ 108,721	$ 112,840	$ 322,865	$ 318,473
Other
REVENUE:
Total Revenue	3,018	$ 2,776	8,878	$ 8,164
Construction costs
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Construction Costs	$ 390		$ 390

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Noncontrolling interest income tax expense	$ 0.2	$ 0.4	$ 0.8	$ 1.2

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 6,191	$ 4,844	$ 16,931	$ 7,605
Other comprehensive income (loss):
Foreign currency translation adjustment	1,521	(1,194)	(1,113)	(694)
Unrealized gain (loss) on derivatives	35	(38)	(143)	(211)
Other comprehensive income (loss), net of tax	1,556	(1,232)	(1,256)	(905)
Comprehensive income (loss)	7,747	3,612	15,675	6,700
Less: Comprehensive income attributable to non-controlling interests	(3,530)	(3,459)	(10,538)	(8,657)
Comprehensive income (loss) attributable to ATN International, Inc.	$ 4,217	$ 153	$ 5,137	$ (1,957)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total ATNI Stockholders' Equity	Common Stock	Treasury Stock, at cost	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Non-Controlling Interests	Total
Balance, beginning of period at Dec. 31, 2018	$ 695,387	$ 172	$ (48,547)	$ 181,778	$ 563,593	$ (1,609)	$ 127,937	$ 823,324
Increase (Decrease) in Stockholders' Equity
Issuance of shares of common stock upon exercise of stock options	62			62				62
Purchase of shares of common stock	(1,837)		(1,837)					(1,837)
Stock-based compensation	4,606			4,606			275	4,881
Dividends declared on common stock	(8,178)				(8,178)		(5,788)	(13,966)
Repurchase of non-controlling interests							(1,353)	(1,353)
Investments made by minority shareholders in consolidated affiliates							488	488
Comprehensive income:
Net income (loss)	(1,052)				(1,052)		8,657	7,605
Other comprehensive income (loss)	(905)					(905)		(905)
Comprehensive income (loss)	(1,957)						8,657	6,700
Balance, end of period at Sep. 30, 2019	688,083	172	(50,384)	186,446	554,363	(2,514)	130,216	818,299
Balance, beginning of period at Jun. 30, 2019	689,683	172	(50,125)	185,112	555,806	(1,282)	128,858	818,541
Increase (Decrease) in Stockholders' Equity
Issuance of shares of common stock upon exercise of stock options	62			62				62
Purchase of shares of common stock	(259)		(259)					(259)
Stock-based compensation	1,272			1,272			275	1,547
Dividends declared on common stock	(2,828)				(2,828)		(1,885)	(4,713)
Repurchase of non-controlling interests							(491)	(491)
Comprehensive income:
Net income (loss)	1,385				1,385		3,459	4,844
Other comprehensive income (loss)	(1,232)					(1,232)		(1,232)
Comprehensive income (loss)	153						3,459	3,612
Balance, end of period at Sep. 30, 2019	688,083	172	(50,384)	186,446	554,363	(2,514)	130,216	818,299
Balance, beginning of period at Dec. 31, 2019	676,122	172	(51,129)	188,471	541,890	(3,282)	129,961	806,083
Increase (Decrease) in Stockholders' Equity
Purchase of shares of common stock	(8,327)		(8,327)					(8,327)
Stock-based compensation	4,419			4,419			189	4,608
Dividends declared on common stock	(8,164)				(8,164)		(6,514)	(14,678)
Repurchase of non-controlling interests	(1,312)			(1,312)			(7,451)	(8,763)
Comprehensive income:
Net income (loss)	6,393				6,393		10,538	16,931
Other comprehensive income (loss)	(1,256)					(1,256)		(1,256)
Comprehensive income (loss)	5,137						10,538	15,675
Balance, end of period at Sep. 30, 2020	667,875	172	(59,456)	191,578	540,119	(4,538)	126,723	794,598
Balance, beginning of period at Jun. 30, 2020	668,730	172	(55,316)	189,785	540,183	(6,094)	128,913	797,643
Increase (Decrease) in Stockholders' Equity
Purchase of shares of common stock	(4,140)		(4,140)					(4,140)
Stock-based compensation	1,793			1,793			94	1,887
Dividends declared on common stock	(2,725)				(2,725)		(962)	(3,687)
Repurchase of non-controlling interests							(4,852)	(4,852)
Comprehensive income:
Net income (loss)	2,661				2,661		3,530	6,191
Other comprehensive income (loss)	1,556					1,556		1,556
Comprehensive income (loss)	4,217						3,530	7,747
Balance, end of period at Sep. 30, 2020	$ 667,875	$ 172	$ (59,456)	$ 191,578	$ 540,119	$ (4,538)	$ 126,723	$ 794,598

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF EQUITY
Issuance of shares of common stock upon exercise of stock options		2,000		2,000
Purchase of shares of common stock	80,754	8,542	161,500	28,393
Dividends declared on common stock (dollars per per share)	$ 0.17	$ 0.17	$ 0.51	$ 0.51

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 16,931	$ 7,605
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	66,089	64,870
Provision for doubtful accounts	4,452	3,796
Amortization of debt discount and debt issuance costs	395	420
Stock-based compensation	4,608	4,881
Deferred income taxes	(6,078)	(6,287)
Loss on equity investments	3,360	2,131
Loss on disposition of long-lived assets	60	321
Unrealized loss on foreign currency	449	233
Other non-cash activity		28
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:
Accounts receivable	(12,189)	(10,193)
Materials and supplies, prepayments, and other current assets	(14,849)	(5,507)
Prepaid income taxes	2,038	5,158
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities	7,382	6,324
Accrued taxes	(1,418)	(19,047)
Other assets	1,057	(2,041)
Other liabilities	(696)	4,155
Net cash provided by operating activities	71,591	56,847
Cash flows from investing activities:
Capital expenditures	(50,662)	(49,486)
Purchase of spectrum, including deposits	(20,396)
Purchases of strategic investments	(2,768)	(10,285)
Proceeds from strategic investments	11,969
Purchase of short-term investments	(116)	(8,028)
Proceeds from sale of short-term investments		5,141
Net cash used in investing activities	(61,973)	(62,658)
Cash flows from financing activities:
Dividends paid on common stock	(8,166)	(8,160)
Distributions to non-controlling interests	(6,503)	(5,760)
Payment of debt issuance costs	(1,096)	(1,340)
Principal repayments of term loan	(2,814)	(2,825)
Purchases of common stock - share based compensation	(1,733)	(1,607)
Purchases of common stock - share buyback	(6,589)	(162)
Repurchases of non-controlling interests	(8,763)	(1,353)
Investments made by minority shareholders in consolidated affiliates		488
Net cash used in financing activities	(35,664)	(20,719)
Effect of foreign currency exchange rates on cash and cash equivalents	(87)	(26)
Net change in cash, cash equivalents, and restricted cash	(26,133)	(26,556)
Total cash, cash equivalents, and restricted cash, beginning of period	162,358	192,907
Total cash, cash equivalents, and restricted cash, end of period	136,225	166,351
Noncash investing activity:
Purchases of property, plant and equipment included in accounts payable and accrued expenses	$ 15,097	$ 7,419

ORGANIZATION AND BUSINESS OPERA

ORGANIZATION AND BUSINESS OPERATIONS	9 Months Ended
	Sep. 30, 2020
ORGANIZATION AND BUSINESS OPERATIONS
ORGANIZATION AND BUSINESS OPERATIONS	1. ORGANIZATION AND BUSINESS OPERATIONS ​ The Company is a holding company that, directly and through its subsidiaries, owns and operates telecommunications businesses in North America, the Caribbean and Bermuda as well as a renewable energy business in India. The Company was incorporated in Delaware in 1987, began trading publicly in 1991 and spun off more than half of its operations to stockholders in 1998. Since that time, has engaged in many strategic acquisitions and investments to help grow its operations, using the generated its established operating units to in its existing businesses , to make strategic investments in additional businesses, and to return cash to the Company’s investors. The Company has built, and seeks to maintain, resources to support its operating subsidiaries and to improve their customer acquisition, retention, and satisfaction while maintaining optimal operating efficiencies. looks businesses that opportunities or potential strategic benefits, but additional capital investment in order to execute on their business plans. holds controlling positions to of its investments and non-controlling positions in others. frequently product and development component in addition to the prospect of generating on its invested capital. ​ The Company has identified three operating segments to manage and review its operations and to facilitate investor presentations of its results. These three operating segments are as follows: ​ ● International Telecom. The Company’s international telecom segment offers services to other telecom providers (“Carrier Services”), such as international long-distance, roaming from other carriers’ customers traveling into the Company’s retail markets, and transport and access services, as well as fixed internet and voice services and retail mobility services to customers in Bermuda, Guyana and the US Virgin Islands. The Company also offers fixed video services in Bermuda, the Cayman Islands, and the US Virgin Islands. In addition, the international telecom segment offers managed information technology services to enterprise customers. ​ ● US Telecom. In the United States, the Company offers carrier services, including wholesale roaming services, site maintenance and the leasing of critical network infrastructure such as towers and transport facilities, as well as fixed and mobile communications services to the Company’s retail and enterprise customers in the Southwestern United States. ​ ● Renewable Energy. In India, the Company provides distributed generation solar power to corporate and industrial customers. ​ The following chart summarizes the operating activities of the Company’s principal subsidiaries, the segments in which the Company reports its revenue and the markets it served as of September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ Segment Services Markets Tradenames International Telecom Mobility Bermuda, Guyana, US Virgin Islands GTT+, One, Viya ​ ​ Fixed Bermuda, Cayman Islands, Guyana, US Virgin Islands GTT+, One, Logic, Viya ​ ​ ​ Carrier Services ​ Bermuda, Guyana, US Virgin Islands ​ GTT+, One, Viya ​ ​ ​ Managed Services ​ Bermuda, Cayman Islands, US Virgin Islands, Guyana ​ Fireminds, One, Logic, Viya, GTT+ ​ US Telecom Mobility United States (rural markets) Commnet, Choice, Choice NTUA Wireless, WestNet, Geoverse ​ ​ ​ Fixed ​ United States ​ Commnet, Choice, Choice NTUA Wireless, Deploycom, WestNet ​ ​ ​ Carrier Services ​ United States ​ Commnet, Essextel ​ ​ Managed Services United States Choice ​ Renewable Energy ​ Solar ​ India ​ Vibrant Energy ​ ​ The Company actively evaluates potential acquisitions, investment opportunities and other strategic transactions, both domestic and international, that meet its return on investment and other criteria. In addition, the Company considers non-controlling investments in earlier stage businesses that it considers strategically relevant, and which may offer long-term growth potential for the Company, either individually, or as research and development businesses that can support the Company’s operating subsidiaries in new product and service development and offerings. The Company provides management, technical, financial, regulatory, and marketing services to its subsidiaries and typically receives a management fee equal to a percentage of their revenues which is eliminated in consolidation. For further information about the Company’s financial segments and geographical information about its operating revenues and assets, see Note 12 to the Consolidated Financial Statements included in this Report. ​ COVID-19 ​ In March 2020, the World Health Organization declared a novel strain of coronavirus, now referred to as COVID-19, as a pandemic, and the virus has now spread globally to over 200 countries and territories, including the United States and other countries in which the Company has substantial operations. The Company is continuing to monitor and assess the effects of the COVID-19 pandemic on its commercial operations, the safety of its employees and their families, its sales force and customers and any potential impact on the Company’s revenue in 2020. ​ The preparation of the condensed consolidated financial statements requires the Company to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, equity, revenues and expenses and related disclosure of contingent assets and liabilities. On an ongoing basis the Company evaluates estimates, judgments and methodologies. The Company assessed certain accounting matters and estimates that generally require consideration of forecasted financial information in context with the information and estimates reasonably available to the Company and the unknown future impacts COVID-19 as of September 30, 2020 and through the date of this report. The accounting matters assessed included, but were not limited to, the Company’s allowance for credit losses, the carrying value of the Company’s goodwill and other long-lived assets, financial assets, valuation allowances for tax assets and revenue recognition. The Company assessed the impacts of COVID-19 on the consolidated financial statements as of and for the quarter ended September 30, 2020, in particular the impacts on lines of revenues, operating expenses as well as the deferral and savings on other operating expenses and capital expenditures. During the three months ended September 30, 2020, while the Company’s International Telecom segment experienced strengthened demand for both its mobile and fixed services, its carrier services revenue declined as a result of a reduction in roaming revenue due to pandemic-related travel and stay-at-home restrictions as compared to the same period of 2019. Such restrictions also resulted in decreased mobile and carrier services revenues within its US Telecom segment during the three months ended September 30, 2020 as compared to the same period of 2019. However, in response to certain anticipated impacts, the Company was able to implement operating expense savings, particularly with respect to its International Telecom segment, that when coupled with Company-wide travel expense savings and capital expenditure deferrals, acted to offset much of the revenue loss or additional credit loss allowances caused by anticipated customer non-payment activity in the quarter. As a result, the Company’s assessment did not indicate that there was a material impact to the Company’s consolidated financial statements as of and for the quarter ended September 30, 2020. However, the Company’s future assessments of the impacts of COVID-19 for the remainder of the year and into 2021or its ability to realize continued operational expense savings, as well as other factors, could result in material impacts to the Company’s consolidated financial statements in future reporting periods. The extent to which the COVID-19 pandemic ultimately impacts the Company’s business, financial condition, results of operations, cash flows, and liquidity may differ from the Company management’s current estimates due to inherent uncertainties regarding the duration and further spread of the outbreak, its severity, actions taken to contain the virus or treat its impact, and how quickly and to what extent economic conditions normalize and more customary operating conditions resume.

BASIS OF PRESENTATION

BASIS OF PRESENTATION	9 Months Ended
	Sep. 30, 2020
BASIS OF PRESENTATION
BASIS OF PRESENTATION	2. BASIS OF PRESENTATION ​ The accompanying condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). The financial information included herein is unaudited; however, the Company believes such information and the disclosures herein are adequate to make the information presented not misleading and reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company’s financial position and results of operations for the periods described therein. The year-end condensed balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Results of interim periods may not be indicative of results for the full year. These condensed consolidated financial statements and related notes should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on March 2, 2020, ​ The condensed consolidated financial statements include the accounts of the Company, its subsidiaries in which the Company holds controlling interests and certain entities which are consolidated in accordance with the provisions of the Financial Accounting Standards Board’s (“FASB”) authoritative guidance on the consolidation of variable interest entities, since it is determined that the Company is the primary beneficiary of these entities. ​ Presentation of Revenue ​ Effective January 1, 2020, the Company changed its presentation of revenue in the Condensed Consolidated Statement of Operations and in the Selected Segment Financial Information tables. This change is intended to better align the Company’s financial performance with the views of management and industry competitors, and to facilitate a more constructive dialogue with the investment community. ​ Specifically, the previously disclosed revenue categories of wireless and wireline revenue are being represented as mobility, fixed and carrier services revenue within the Company’s segment information and are included within communications services revenue within its Statements of Operations. Managed services revenue, which was previously a component of wireline revenue, along with revenue from the Company’s Renewable Energy operations, is now included in other revenue. Construction revenue is also included as a component of other revenue. ​ Recent Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” and subsequently issued related updates (“ASU 2016-02”), which provide comprehensive lease accounting guidance. The standard requires entities to recognize lease assets and liabilities on the balance sheet as well as disclosure of key information about leasing arrangements. ASU 2016-02 became effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The Company adopted ASC 2016-02 on January 1, 2019 utilizing the optional transition method with a cumulative adjustment on the date of adoption and not adjusting prior periods. Refer to Note 4 of the Condensed Consolidated Financial Statements. ​ In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815) – Targeted Improvements to Accounting for Hedging Activities” (“ASU 2017-12”). The standard: (a) expands and refines hedge accounting for both financial and non-financial risk components, (b) aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and (c) includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The guidance is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company adopted this standard on January 1, 2019. There was not a material impact to the Company’s Consolidated Financial Statements upon adoption. ​ In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). ASU 2016-13 requires entities to use a new forward-looking, expected loss model to estimate credit losses. It also requires additional disclosure relating to the credit quality of trade and other receivables, including information relating to management’s estimate of credit allowances. The Company adopted ASU 2016-13 using the modified retrospective approach on its January 1, 2020 effective date. Refer to Note 3 of the Condensed Consolidated Financial Statements in this Report. ​

REVENUE RECOGNITION AND RECEIVA

REVENUE RECOGNITION AND RECEIVABLES	9 Months Ended
	Sep. 30, 2020
REVENUE RECOGNITION AND RECEIVABLES
REVENUE RECOGNITION AND RECEIVABLES	3. REVENUE RECOGNITION AND RECEIVABLES ​ Contract Assets and Liabilities ​ The Company recognizes contract assets and liabilities on its balance sheet. Contract assets represent unbilled amounts typically resulting from retail wireless contracts with both a multiyear service period and a promotional discount. In these contracts the revenue recognized exceeds the amount billed to the customer. The current portion of the contract asset is recorded in prepayments and other current assets and the noncurrent portion is included in other assets on the Company’s balance sheets. ​ Contract liabilities consist of advance payments and billings in excess of revenue recognized. Retail revenue for postpaid customers is generally billed one month in advance and recognized over the period that the corresponding service is rendered to customers. To the extent the service is not provided by the reporting date the amount is recognized as a contract liability. Prepaid service, including mobile voice and data services, sold to customers is recorded as deferred revenue prior to the commencement of services. Contract liabilities are recorded in advanced payments and deposits on the Company’s balance sheets. ​ In July 2019 and August 2020, the Company entered into a Network Build and Maintenance Agreement (the “FirstNet Agreement”) and First Amendment to that agreement with AT&T Mobility, LLC (“AT&T”), respectively, to build a portion of AT&T’s network for the First Responder Network Authority (“FirstNet”) as well as a commercial wireless network in or near the Company’s current operating area in the Southwestern United States (the “FirstNet Transaction”). The transaction includes construction and service performance obligations. The Company allocated the transaction price of the FirstNet Agreement to each performance obligation based on the relative standalone selling price of each performance obligation in the contract. The standalone selling price is the estimated price the Company would charge for the good or service in a separate transaction with similar customers in similar circumstances. ​ The Company has certain wholesale roaming agreements that contain stand ready performance obligations and management allocates transaction value to performance obligations based on the standalone selling price. The standalone selling price is the estimated price the Company would charge for the good or service with similar customers in similar circumstances. Management determined the performance obligations were obligations to make the service continuously available and will recognize revenue evenly over the service period. ​ Contract assets and liabilities consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ December 31, 2019 ​ ​ $ Change ​ % Change Contract asset – current $ 2,269 ​ $ 2,413 ​ $ (144) ​ (6) % Contract asset – noncurrent ​ 699 ​ ​ 905 ​ ​ (206) ​ (23) % Contract liability – current ​ (16,338) ​ ​ (15,044) ​ ​ (1,294) ​ (9) % Contract liability – noncurrent ​ (2,486) ​ ​ (5,450) ​ ​ 2,964 ​ 54 % Net contract liability $ (15,856) ​ $ (17,176) ​ $ 1,320 ​ 8 % ​ The contract asset – current is included in prepayments and other current assets and the contract asset – noncurrent is included in other assets on the Company’s balance sheet. The contract liability – current is included in advance payments and deposits and the contract liability – noncurrent is included in other liabilities on the Company’s balance sheet. The decrease in the Company’s net contract liability was due to the timing of customer prepayments, contract billings, and the FirstNet Transaction. During the nine months ended September 30, 2020, the Company recognized revenue of $15.0 million related to its December 31, 2019 contract liability. During the three and nine months ended September 30, 2020, the Company recognized $0.5 million and $1.9 million, respectively, of the December 31, 2019 contract asset into revenue. The Company did not recognize any revenue in the nine months ended September 30, 2020 related to performance obligations that were satisfied or partially satisfied in previous periods. ​ Contract Acquisition Costs ​ The September 30, 2020 balance sheet includes current contract acquisition costs of $1.8 million in prepayments and other current assets and long term contract acquisition costs of $1.1 million in other assets. During the three and nine months ended September 30, 2020, the Company amortized $0.5 million and $1.5 million, respectively, of contract acquisition cost. ​ Remaining Performance Obligations ​ Remaining performance obligations represent the transaction price allocated to unsatisfied performance obligations of certain multiyear retail wireless contracts, which include a promotional discount, and the Company’s construction and service contracts. The transaction price allocated to unsatisfied performance obligations was $321 million and $241 million at September 30, 2020 and December 31, 2019, respectively. The Company expects to satisfy the majority of the remaining performance obligations and recognize the transaction price within 24 months and the remainder thereafter. ​ The Company has certain retail, wholesale, and renewable energy contracts where transaction price is allocated to remaining performance obligations. However, the Company omits these contracts from its disclosure by applying the right to invoice , one year or less, and wholly unsatisfied performance obligation practical expedients. ​ Disaggregation ​ The Company's revenue is presented on a disaggregated basis in Note 12 based on an evaluation of disclosures outside the financial statements, information regularly reviewed by the chief operating decision makers for evaluating the financial performance of operating segments and other information that is used for performance evaluation and resource allocations. This includes revenue from Communication Services and other revenue. Communication Services revenue is further disaggregated into mobility, fixed, carrier services, and other services. Other revenue is further disaggregated into renewable energy, managed services and construction revenue. This disaggregation of revenue depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. ​ Receivables ​ The Company adopted ASU 2016-13 on January 1, 2020. The standard requires that certain financial assets be measured at amortized cost reflecting an allowance for estimated credit losses expected to occur over the life of the assets. The estimate of credit losses is based on all relevant information including historical information, current conditions, and reasonable and supportable forecasts that affect the collectability of the amounts. The Company adopted ASU 2016-13 using the modified retrospective approach, however, there was no impact of adoption on retained earnings. ​ The standard impacted the Company’s calculation of credit losses from trade receivables. Historically, the Company recorded credit losses subsequent to the initial revenue transaction. After adoption of ASU 2016-13, the Company will record an estimate of future credit losses in conjunction with the revenue transaction based on the information available including historical experience and management’s expectations of future conditions. Those estimates will be updated as additional information becomes available. Our allowance for uncollectible accounts receivable is based on management’s assessment of the collectability of assets pooled together with similar risk characteristics. There is no significant impact to the Company’s operating results for the current period due to the adoption of this standard. ​ million. At January 1, 2020 the Company had gross accounts receivable of $48.6 million and an allowance for credit losses of $12.7 million. The Company monitors receivables through the use of historical operating data adjusted for expectation of future performance as appropriate. Activity in the allowance for credit losses is below: ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2020 ​ ​ ​ ​ Balance at January 1, 2020 $ 12,724 Current period provision for expected losses ​ 4,452 Write-offs charged against the allowance ​ (5,434) Recoveries collected ​ ​ 466 Balance at September 30, 2020 ​ $ 12,208 ​

LEASES

LEASES	9 Months Ended
	Sep. 30, 2020
LEASES
LEASES	4. LEASES ​ The Company adopted ASU 2016-02 on January 1, 2019, utilizing the optional transition method with a cumulative adjustment on the date of adoption. Under this approach, the guidance was applied to leases that had commenced as of January 1, 2019 with a cumulative effect adjustment as of that date and prior periods were not adjusted. Upon adoption, the Company recognized an operating lease right-of-use (“ROU”) asset of $70.8 million, a short-term lease liability of $8.2 million, and a long-term lease liability of $61.2 million. The adoption had no impact on retained earnings or other components of equity. The Company elected the package of practical expedients . Under the package of practical expedients, for existing leases, the Company does not reassess: i) whether the arrangement contains a lease; ii) lease classification and; iii) initial direct costs. The Company has operating and financing leases for towers, land, corporate offices, retail facilities, vehicles, and data transport capacity. The lease terms are generally between three and ten years , some of which include additional renewal options. ​ Supplemental lease information ​ The components of lease expense were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ Three months ended September 30, 2019 ​ Nine months ended September 30, 2020 ​ Nine months ended September 30, 2019 Operating lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease cost $ 4,152 ​ $ 3,627 ​ $ 12,228 ​ $ 11,294 Short-term lease cost ​ 769 ​ ​ 652 ​ ​ 2,040 ​ ​ 2,232 Variable lease cost ​ 692 ​ ​ 1,151 ​ ​ 3,034 ​ ​ 2,400 Total operating lease cost $ 5,613 ​ $ 5,430 ​ $ 17,302 ​ $ 15,926 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Finance lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortization of right-of-use asset $ 534 ​ $ 570 ​ $ 1,628 ​ $ 1,749 Variable costs ​ 198 ​ ​ 244 ​ ​ 655 ​ ​ 802 Total finance lease cost $ 732 ​ $ 814 ​ $ 2,283 ​ $ 2,551 ​ During the nine months ended September 30, 2020 and 2019, the Company paid $9.1 million and $10.2 million, respectively, for operating lease liabilities. During the nine months ended September 30, 2020 and 2019, the Company recorded million, respectively, of operating lease liabilities arising from ROU assets. ​ At September 30, 2020, finance leases with a cost of $25.2 million and accumulated amortization of $9.0 million were included in property , plant and equipment. During the nine months ended September 30, 2020, the Company paid million of additional finance lease liabilities. At September 30, 2020, finance leases had a lease liability of million was current. At December 31, 2019, finance leases with a cost of ​ The weighted average remaining lease terms and discount rates as of September 30, 2020 and December 31, 2019 are noted in the table below: ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ December 31, 2019 Weighted-average remaining lease term ​ ​ ​ ​ ​ Operating leases ​ 6.0 years ​ ​ 6.5 years Financing leases ​ 10.5 years ​ ​ 11.7 years ​ ​ ​ ​ ​ ​ Weighted-average discount rate ​ ​ ​ ​ ​ Operating leases ​ 5.0% ​ ​ 5.0% Financing leases ​ 3.3% ​ ​ n/a ​ Maturities of lease liabilities as of September 30, 2020 were as follows (in thousands): ​ ​ ​ ​ ​ Operating Leases 2020 (excluding the nine months ended September 30, 2020) $ 3,014 2021 ​ 15,761 2022 ​ 14,170 2023 ​ 11,789 2024 ​ 10,466 Thereafter ​ 19,885 Total lease payments ​ 75,085 Less imputed interest ​ (10,640) Total $ 64,445 ​ Maturities of lease liabilities as of December 31, 2019 were as follows (in thousands): ​ ​ ​ ​ ​ Operating Leases 2020 $ 14,526 2021 ​ 13,714 2022 ​ 12,787 2023 ​ 10,713 2024 ​ 9,671 Thereafter ​ 18,354 Total lease payments ​ 79,765 Less imputed interest ​ (12,195) Total $ 67,570 ​ As of September 30, 2020, the Company did not have any material operating or finance leases that have not yet commenced.

USE OF ESTIMATES

USE OF ESTIMATES	9 Months Ended
	Sep. 30, 2020
USE OF ESTIMATES
USE OF ESTIMATES	5. USE OF ESTIMATES ​ The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. The most significant estimates relate to the allowance for credit losses, useful lives of the Company’s fixed and finite-lived intangible assets, allocation of purchase price to assets acquired and liabilities assumed in business combinations, fair value of indefinite-lived intangible assets, goodwill, assessing the impairment of assets, revenue, and income taxes. Actual results could differ significantly from those estimates. See Note 1 for a discussion of the impact of COVID-19 on the use of these estimates. ​

FAIR VALUE MEASUREMENTS AND INV

FAIR VALUE MEASUREMENTS AND INVESTMENTS	9 Months Ended
	Sep. 30, 2020
FAIR VALUE MEASUREMENTS AND INVESTMENTS
FAIR VALUE MEASUREMENTS AND INVESTMENTS	6. FAIR VALUE MEASUREMENTS AND INVESTMENTS ​ In accordance with the provisions of fair value accounting, a fair value measurement assumes that a transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability, and defines fair value based upon an exit price model. The fair value measurement guidance establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value: ​ ​ ​ Level 1 ​ Quoted prices in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset and liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 1 assets and liabilities include money market funds, debt and equity securities and derivative contracts that are traded in an active exchange market. ​ ​ ​ ​ Level 2 ​ Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. This category generally includes corporate obligations and non-exchange traded derivative contracts. ​ ​ ​ ​ Level 3 ​ Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments and intangible assets that have been impaired whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. ​ ​ ​ Assets and liabilities of the Company measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019 are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ Significant Other ​ ​ Quoted Prices in ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Active Markets ​ Inputs ​ Inputs ​ ​ ​ Description ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Total Certificates of deposit ​ $ — ​ $ 380 ​ $ — ​ $ 380 Money market funds ​ ​ 2,450 ​ ​ — ​ ​ — ​ ​ 2,450 Short term investments ​ ​ 403 ​ ​ — ​ ​ — ​ ​ 403 Other investments ​ ​ — ​ ​ — ​ ​ 13,172 ​ ​ 13,172 Interest rate swap ​ ​ — ​ ​ (189) ​ ​ — ​ ​ (189) Total assets and liabilities measured at fair value ​ $ 2,853 ​ $ 191 ​ $ 13,172 ​ $ 16,216 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Significant Other ​ ​ ​ Quoted Prices in ​ Observable ​ Unobservable ​ ​ ​ ​ ​ ​ Active Markets ​ Inputs ​ Inputs ​ ​ ​ ​ Description ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Total Certificates of deposit ​ $ — ​ $ 380 ​ $ — ​ $ 380 ​ Money market funds ​ ​ 2,329 ​ ​ — ​ ​ — ​ ​ 2,329 ​ Short term investments ​ ​ 416 ​ ​ — ​ ​ — ​ ​ 416 ​ Other investments ​ ​ — ​ ​ — ​ ​ 12,700 ​ ​ 12,700 ​ Interest rate swap ​ ​ — ​ ​ (56) ​ ​ — ​ ​ (56) ​ Total assets and liabilities measured at fair value ​ $ 2,745 ​ $ 324 ​ $ 12,700 ​ $ 15,769 ​ ​ Certificate of Deposit ​ As of September 30, 2020 and December 31, 2019, this asset class consisted of a time deposit at a financial institution denominated in US dollars. The asset class is classified within Level 2 of the fair value hierarchy because the fair value was based on observable market data. ​ Money Market Funds ​ As of September 30, 2020 and December 31, 2019, this asset class consisted of a money market portfolio that comprises Federal government and US Treasury securities. The asset class is classified within Level 1 of the fair value hierarchy because its underlying investments are valued using quoted market prices in active markets for identical assets. ​ Short Term Investments and Commercial Paper ​ As of September 30, 2020 and December 31, 2019, these asset classes consisted of short term foreign and US corporate bonds, equity securities, and commercial paper. Corporate bonds and commercial paper are classified within Level 2 of the fair value hierarchy because the fair value is based on observable market data. Equity securities are classified within Level 1 because fair value is based on quoted market prices in active markets for identical assets. The Company held equity securities with a fair value of $0.1 million and $0.2 million at September 30, 2020 and December 31, 2019, respectively. Net income includes $0.1 million of losses for the nine months ended September 30, 2020. No gain or loss was recorded in the three and nine months ended September 30, 2019. ​ Other Investments ​ In the first quarter of 2019, the Company made an investment in an early-stage venture through the acquisition of a convertible debt instrument. The Company elected to fair value the investment upon acquisition. At September 30, 2020, the fair value of the investment was $10.8 million. During the three and nine months ended September 30, 2020, the Company recorded $0.1 million of expense and $0.6 million of income, respectively, from changes in the fair value of the investment. The asset is classified within Level 3 of the fair value hierarchy. The Company used the income approach to fair value the investment and the inputs consisted of a discount rate calculated based on the investment attributes and the probability of potential future scenarios occurring. ​ In the third quarter of 2019, the Company made a $14.4 million investment in a renewable energy partnership, as a tax equity investor. The Company received an investment tax credit of $12.0 million in the three months ended September 30, 2020 and will receive future cash distributions from the partnership’s operations. The Company elected the deferral method to account for the credit and elected the fair value option to account for the equity investment. The Company’s investment had a fair value of $2.4 million at September 30, 2020, and $2.5 million at December 31, 2019. The asset is classified within Level 3 of the fair value hierarchy. The Company used the income approach to fair value the investment and the inputs consisted of a discount rate and future cash flows calculated based on the investment attributes. The Company also holds investments in equity securities consisting of non-controlling investments in privately held companies. These investments, over which the Company does not have the ability to exercise significant influence, are without readily determinable fair values. The investments are measured at cost, less any impairment, adjusted for observable price changes of similar investments of the same issuer. Fair value is not estimated for these investments if there are no identified events or changes in circumstances that may have an effect on the fair value of the investment. The carrying value of the investments was $1.3 million at September 30, 2020 and $2.1 million at December 31, 2019. During the three months ended September 30, 2020 the Company recorded a loss of million as the result of an observable price change in the investments. These investments are included with other assets on the consolidated balance sheets. Equity Method Investments In the first quarter of 2020, the Company increased its ownership in one investment of a privately held company to approximately 24% of the outstanding voting equity through an additional $2.8 million investment. With this investment the Company obtained the ability to exercise significant influence over the investee and began accounting for the investment under the equity method of accounting including the recording of its share of the investee’s earnings or losses. The carrying value of the investment was million at September 30, 2020 and December 31, 2019, respectively. The value increased million. The investment is included with other assets on the consolidated balance sheets. Other Fair Value Disclosures The carrying amounts of cash and cash equivalents, accounts receivable, and accounts payable and accrued expenses approximate their fair values because of the relatively short-term maturities of these financial instruments. The fair value of the interest rate swap is measured using Level 2 inputs. The fair value of long-term debt is estimated using Level 2 inputs. At September 30, 2020, the fair value of long-term debt, including the current portion, was million. At December 31, 2019, the fair value of long-term debt, including the current portion, was

LONG-TERM DEBT

LONG-TERM DEBT	9 Months Ended
	Sep. 30, 2020
LONG-TERM DEBT
LONG-TERM DEBT	7. LONG-TERM DEBT ​ On April 10, 2019, the Company entered into a credit facility, with CoBank, ACB and a syndicate of other lenders (the “2019 Credit Facility”). The 2019 Credit Facility provides for a $200 million revolving credit facility that includes up to (i) $75 million for standby or trade letters of credit and (ii) $10 million under a swingline sub-facility. Approximately $16.0 million of performance and standby letters of credit have been issued and remain outstanding and undrawn as of September 30, 2020. The 2019 Credit Facility matures on April 10, 2024. ​ Amounts borrowed under the 2019 Credit Facility bear interest at a rate equal to, at the Company’s option, either (i) the London Interbank Offered Rate (“LIBOR”) plus an applicable margin ranging between 1.25% to 2.25% or (ii) a base rate plus an applicable margin ranging from 0.25% to 1.25%. Swingline loans bear interest at the base rate plus the applicable margin for base rate loans. The base rate is equal to the higher of (i) 1.00% plus the higher of (x) the LIBOR for an interest period of one month and (y) the LIBOR for an interest period of one week; (ii) the Federal Funds Effective Rate (as defined in the 2019 Credit Facility) plus 0.50% per annum; and (iii) the Prime Rate (as defined in the 2019 Credit Facility). The applicable margin is determined based on the Total Net Leverage Ratio (as defined in the 2019 Credit Facility). Under the terms of the 2019 Credit Facility, we must also pay a fee ranging from 0.150% to 0.375% of the average daily unused portion of the 2019 Credit Facility over each calendar quarter. The 2019 Credit Facility contains customary representations, warranties and covenants, including a financial covenant that imposes a maximum ratio of indebtedness to EBITDA as well as covenants limiting additional indebtedness, liens, guaranties, mergers and consolidations, substantial asset sales, investments and loans, sale and leasebacks, transactions with affiliates and fundamental changes. The Company’s investments in “unrestricted” subsidiaries and certain dividend payments to the Company’s stockholders are not limited unless the Total Net Leverage Ratio is equal to or greater than 1.75 to 1.0. The Total Net Leverage Ratio is measured each fiscal quarter and is required to be less than or equal to 2.75 to 1.0. In the event of a Qualifying Acquisition (as defined in the 2019 Credit Facility), the Total Net Leverage Ratio increases to 3.25 to 1.0 for the subsequent three fiscal quarters. ​ The 2019 Credit Facility also provides for the incurrence by the Company of incremental term loan facilities, when combined with increases to revolving loan commitments, in an aggregate amount not to exceed $200 million (the “Accordion”). Amounts borrowed under the Accordion are also subject to proforma compliance with a net leverage ratio financial covenant. ​ As of September 30, 2020, the Company was in compliance with all of the financial covenants, had no outstanding borrowings and, net of the $16.0 million of outstanding performance letters of credit, had $184.0 million of availability under the 2019 Credit Facility. ​ FirstNet Receivables Credit Facility ​ On March 26, 2020, Commnet Finance, a wholly owned subsidiary of Commnet Wireless, entered into a receivables credit facility with the Company, Commnet Wireless, and CoBank, ACB (the “Receivables Credit Facility”). The Receivables Credit Facility provides for a senior secured delayed draw term loan in an aggregate principal amount of up to $75 million and the proceeds may be used to acquire certain receivables from Commnet Wireless. The receivables to be financed and sold under the Receivables Credit Facility, which provide the loan security, relate to the obligations of AT&T under the FirstNet Agreement. The delayed draw period will expire on December 31, 2021. ​ The maturity date for each loan will be set by CoBank and will match the weighted average maturity of the receivables financed. ​ Interest on the loans accrues at a rate based on (i) the LIBOR plus 2.50%, (ii) a base rate plus 1.50% or (iii) a fixed annual interest rate to be quoted by CoBank The Receivables Credit Facility contains customary events of termination, representations and warranties, affirmative and negative covenants and events of default customary for facilities of this type. ​ As of September 30, 2020, the Company had no outstanding borrowings under the Receivables Credit Facility. Viya Debt ​ The Company, and certain of its subsidiaries, have entered into a $60.0 million loan agreement (the “Viya Debt”) with Rural Telephone Finance Cooperative (“RTFC”). The Viya Debt agreement contains customary representations, warranties and affirmative and negative covenants (including limitations on additional debt, guaranties, sale of assets and liens) and a financial covenant that limits the maximum ratio of indebtedness to annual operating cash flow to 3.5 to 1.0 (the “Net Leverage Ratio”). This covenant is tested on an annual basis at the end of each fiscal year. Interest is paid quarterly at a fixed rate of 4.0% and principal repayment is not required until maturity on July 1, 2026. Prepayment of the Viya Debt may be subject to a fee under certain circumstances. The debt is secured by certain assets of the Company’s Viya subsidiaries and is guaranteed by the Company. With RTFC’s consent, the Company funded the restoration of Viya’s network, following Hurricanes Irma and Maria, through an intercompany loan arrangement with a $75.0 million limit. The Company was not in compliance with the Net Leverage Ratio covenant for the year ending December 31, 2019 and received a waiver from the RTFC on February 26, 2020. ​ The Company paid a fee of $0.9 million in 2016 to lock in the interest rate at 4% per annum over the term of the Viya Debt. The fee was recorded as a reduction to the Viya Debt carrying amount and is being amortized over the life of the loan. ​ As of September 30, 2020, $60.0 million of the Viya Debt remained outstanding and $0.5 million of the rate lock fee was unamortized. ​ One Communications Debt ​ The Company has an outstanding loan from HSBC Bank Bermuda Limited (the “One Communications Debt”) which is scheduled to mature on May 22, 2022 and bears interest at the one-month LIBOR plus a margin ranging between 2.5% to 2.75%, paid quarterly. ​ The One Communications Debt contains customary representations, warranties and affirmative and negative covenants (including limitations on additional debt, guarantees, sale of assets and liens) and financial covenants, tested annually as of and for the twelve months ended December 31st, that limit the ratio of tangible net worth to long term debt and total net debt to EBITDA and require a minimum debt service coverage ratio (as defined in the One Communications Debt agreement). The Company was in compliance with its covenants as of December 31, 2019. As a condition of the One Communications Debt, the Company was required to enter into a hedging arrangement with a notional amount equal to at least 30% of the outstanding loan balance and a term corresponding to the term of the One Communications Debt. As such, the Company entered into an amortizing interest rate swap that has been designated as a cash flow hedge, which had an original notional amount of $11.0 million, has an interest rate of 1.874%, and expires in March 2022. As of September 30, 2020, the swap had an unamortized notional amount of $7.6 million. The Company capitalized $0.3 million of fees associated with the One Communications Debt which are being amortized over the life of the debt and are recorded as a reduction to the debt carrying amount. As of September 30, 2020, $24.3 million of the One Communications Debt was outstanding and $0.1 million of the capitalized fees remained unamortized. ​

GOVERNMENT GRANTS

GOVERNMENT GRANTS	9 Months Ended
	Sep. 30, 2020
GOVERNMENT GRANTS
GOVERNMENT GRANTS	8. GOVERNMENT GRANTS ​ The Federal Universal Service Fund (“USF”) is a subsidy program managed by the Federal Communications Commission (“FCC”). USF funds are disbursed to telecommunication providers through programs: the High Cost Program; Low Income Program (“Lifeline Program”); Schools and Libraries Program (“E-Rate Program”); and Rural Health Care Program. The Company participates in the High Cost Program, Lifeline Program, E-Rate Program, and Rural Health Care Support Program as further described below. All of these funding programs are subject to certain operational and reporting compliance requirements. The Company believes it is in compliance with all applicable requirements. ​ During the three and nine month periods ended September 30, 2020, the Company recorded $4.1 million and $12.3 million, respectively, of revenue from the High Cost Program in its International Telecom segment. During the three and nine month periods ended September 30, 2019, the Company recorded million, respectively, of revenue from the High Cost Program in its International Telecom segment. Also, during the three and nine month periods ended September 30, 2020, the Company recorded million, respectively, of High Cost Program revenue in its US Telecom segment. During the three and nine month periods ended September 30, 2019, the Company recorded million, respectively, of High Cost Program revenue in its US Telecom segment. The Company is subject to certain operational, reporting and construction requirements as a result of this funding, and the Company believes that it is in compliance with all of these requirements. ​ In August 2018, the Company was awarded $79.9 million over 10 years under the Connect America Fund Phase II Auction. The Company is required to provide fixed broadband and voice services to certain eligible areas in the United States. The Company is subject to operational and reporting requirements under the program and the Company expects to incur additional capital expenditures to comply with these requirements. The Company determined the award is a revenue grant, and as a result the Company will record the funding as revenue upon receipt. During the three and nine month periods ended September 30, 2020, the Company recorded million, respectively, of revenue from the Connect America Fund Phase II program. During the three and nine months ended September 30, 2019, the Company recorded ​ Once these projects are constructed, the Company is obligated to provide service to the participants. The Company receives funds upon construction completion and is in various stages of constructing the networks. The Company did t receive any funds during the nine months ended September 30, 2020. During 2019, the Company received million offset operating activities. The Company expects to meet all requirements associated with these grants. ​ The Company also receives funding to provide discounted telecommunication services to eligible customers under the E-Rate Program, Lifeline Program, and Rural Health Care Support Program. During the three and nine months ended September 30, 2020, the Company recorded revenue of million, respectively, in the aggregate from these programs. During the three and nine months ended September 30, 2019, the Company recorded revenue of million, respectively, in the aggregate from these programs. The Company is subject to certain operational and reporting requirements under the above mentioned programs and it believes that it is in compliance with all of these requirements. ​ Tribal Bidding Credit ​ As part of the broadcast television spectrum incentive auction, the FCC implemented a tribal lands bidding credit to encourage deployment of wireless services utilizing 600 MHz spectrum on the lands of federally recognized tribes. The Company received a bidding credit of $7.4 million under this program in 2018. A portion of these funds will be used to offset network capital costs and a portion will be used to offset the costs of supporting the networks. The Company’s current estimate is that it will use $5.4 million to offset capital costs, consequently reducing future depreciation expense and $2.0 million to offset the cost of supporting the network which will reduce future operating expense. Through September 30, 2020, the Company has spent $5.1 million on capital expenditures and has recorded $0.1 million in offsets to the cost of supporting the network. The credits are subject to certain requirements, including deploying service by January 2021 and meeting minimum coverage metrics. If the requirements are not met the funds may be subject to claw back provisions. The Company currently expects to comply with all applicable requirements related to these funds. ​ CBRS Auction ​ During the third quarter of 2020, the Company participated in the FCC’s Citizens Broadband Radio Service (CBRS) auction for Priority Access Licenses (PALs). These PALs are licensed on a county-by-county basis and are awarded for a 10-year renewable term. The Company bid on and was awarded PALs located strategically throughout the United States and made an investment of approximately $20.4 million. In connection with the awarded licenses, the Company will have to achieve certain CBRS spectrum build out obligations. The Company currently expects to comply with all applicable requirements related to these licenses. ​

RETIREMENT PLANS

RETIREMENT PLANS	9 Months Ended
	Sep. 30, 2020
RETIREMENT PLANS
RETIREMENT PLANS	9. RETIREMENT PLANS ​ The Company has noncontributory defined benefit pension and noncontributory defined medical, dental, vision, and life benefit plans for eligible employees in its International Telecom segment who meet certain eligibility criteria. The Company recorded the net periodic benefit cost identified below (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ ​ September 30, 2020 September 30, 2019 ​ ​ ​ Pension benefits ​ Postretirement benefits ​ Pension benefits ​ Postretirement benefits ​ Operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost ​ $ (164) ​ $ 32 ​ $ 447 ​ $ 37 ​ Non-operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest cost ​ ​ 603 ​ ​ 45 ​ ​ 841 ​ ​ 40 ​ Expected return on plan assets ​ (414) ​ — ​ ​ (1,263) ​ — ​ Actuarial (gain)/ loss ​ ​ (7) ​ ​ (15) ​ ​ 7 ​ ​ (17) ​ Net periodic pension expense ​ $ 18 ​ $ 62 ​ $ 32 ​ $ 60 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended ​ ​ ​ September 30, 2020 September 30, 2019 ​ ​ ​ Pension benefits ​ Postretirement benefits ​ Pension benefits ​ Postretirement benefits ​ Operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost ​ $ 682 ​ $ 96 ​ $ 1,342 ​ $ 111 ​ Non-operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest cost ​ ​ 2,361 ​ ​ 135 ​ ​ 2,524 ​ ​ 120 ​ Expected return on plan assets ​ (2,730) ​ — ​ (3,790) ​ — ​ Actuarial (gain)/ loss ​ ​ (21) ​ ​ (45) ​ ​ 22 ​ ​ (51) ​ Net periodic pension expense ​ $ 292 ​ $ 186 ​ $ 98 ​ $ 180 ​ ​ In the first quarter of 2020, the Company began the process of winding up one of its pension plans. At December 31, 2019 this plan had assets of $15.1 million and a projected benefit obligation of $15.6 million. ​ The Company was not required to make contributions to its pension plans during the nine months ended September 30, 2020 and 2019. However, the Company periodically evaluates whether to make discretionary contributions. During the nine months ended September 30, 2020 and 2019, the Company contributed million, respectively, to its pension plans. The Company funds its postretirement benefit plans as claims are made. ​ ​

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2020
INCOME TAXES
INCOME TAXES	10. INCOME TAXES ​ The Company’s effective tax rate for the three months ended September 30, 2020 and 2019 was 1.5% and 27.5%, respectively. ​ On March 27, 2020, the U.S. federal government enacted the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). The CARES Act, among other things, allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. ​ The effective tax rate for the three months ended September 30, 2020 was primarily impacted by the following items: (i) the remeasurement of a forecasted domestic loss at a higher tax rate due to carryback provisions as provided by the CARES Act, (ii) the mix of income generated among the jurisdictions in which the Company operates along with the exclusion of losses in India where the Company cannot benefit from those losses as required by ASC 740-270-30-36(a) and, (iii) discrete items including a $0.4 million expense for interest on unrecognized tax positions, a $0.2 million expense to record a valuation allowance against an investment write-off which cannot be currently benefitted for tax, and a $0.6 million benefit (net) related to the utilization of losses at a higher tax rate as allowed by the CARES Act. ​ The effective tax rate for the three months ended September 30, 2019 was primarily impacted by the mix of income generated among the jurisdictions in which the Company operates along with the exclusion of losses in the US Virgin Islands and India where the Company cannot benefit from those losses as required by ASC 740-270-30-36(a), in addition to the following discrete items: (i) a $1.3 million deferred tax benefit related to an investment tax credit, and (ii) a $0.5 million net interest expense on unrecognized tax positions. ​ The Company’s effective tax rate for the nine months ended September 30, 2020 and 2019 was (6.7%) and 26.7%, respectively. ​ The effective tax rate for the nine months ended September 30, 2020 was primarily impacted by the following items: (i) the remeasurement of a forecasted domestic loss at a higher tax rate due to carryback provisions as provided by the CARES Act, (ii) the mix of income generated among the jurisdictions in which the Company operates along with the exclusion of losses in India where the Company cannot benefit from those losses as required by ASC 740-270-30-36(a) and, (iii) discrete items including a $2.9 million benefit from the reversal of an unrecognized tax position due to statute expiration, a $1.4 million expense for interest on unrecognized tax positions, a $0.6 million expense to record a valuation allowance against investment write-downs which cannot be benefitted for tax purposes, and a $1.0 million benefit (net) related to the utilization of losses at a higher rate as allowed by the CARES Act. ​ The effective tax rate for the nine months ended September 30, 2019 was primarily impacted by the mix of income generated among the jurisdictions in which the Company operates along with the exclusion of losses in the US Virgin Islands and India where the Company cannot benefit from those losses as required by ASC 740-270-30 36(a), in addition to the following discrete items: (i) a $1.3 million deferred tax benefit related to an investment tax credit, and (ii) a $0.5 million benefit from the reversal of a deferred tax liability due to an intercompany debt restructure. ​ The Company’s effective tax rate is based upon estimated income before provision for income taxes for the year, composition of the income in different countries, and adjustments, if any, in the applicable quarterly periods for potential tax consequences, benefits and/or resolutions of tax contingencies. The Company’s consolidated tax rate will continue to be impacted by any transactional or one-time items in the future and the mix of income in any given year generated among the jurisdictions in which the Company operates. While the Company believes it has adequately provided for all tax positions, amounts asserted by taxing authorities could materially differ from the Company’s accrued positions as a result of uncertain and complex application of tax law and regulations. Additionally, the recognition and measurement of certain tax benefits include estimates and judgment by management. Accordingly, the Company could record additional provisions or benefits for US federal, state, and foreign tax matters in future periods as new information becomes available. ​

NET INCOME (LOSS) PER SHARE

NET INCOME (LOSS) PER SHARE	9 Months Ended
	Sep. 30, 2020
NET INCOME (LOSS) PER SHARE
NET INCOME (LOSS) PER SHARE	11. NET INCOME (LOSS) PER SHARE ​ For each of the three months ended September 30, 2020 and 2019, the calculations of basic and diluted weighted average shares of common stock outstanding do not include 5,000 shares relating to stock options as the effects of those options were anti-dilutive. ​ For each of the nine months ended September 30, 2020 and 2019, the calculations of basic and diluted weighted average shares of common stock outstanding do not include 5,000 and 38,564 shares, respectively, relating to stock options as the effects of those options were anti-dilutive.

SEGMENT REPORTING

SEGMENT REPORTING	9 Months Ended
	Sep. 30, 2020
SEGMENT REPORTING
SEGMENT REPORTING	12. SEGMENT REPORTING ​ The Company has the following three reportable and operating segments: i) International Telecom, ii) US Telecom, and iii) Renewable Energy. ​ The following tables provide information for each operating segment (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 21,406 ​ $ 2,432 ​ $ — ​ $ — ​ $ 23,838 Fixed ​ ​ 57,364 ​ 5,419 ​ — ​ — ​ 62,783 Carrier Services ​ ​ 1,851 ​ ​ 19,852 ​ ​ — ​ ​ — ​ ​ 21,703 Other ​ 397 ​ ​ — ​ ​ — ​ ​ — ​ ​ 397 Total Communication Services Revenue ​ 81,018 ​ ​ 27,703 ​ ​ — ​ ​ — ​ ​ 108,721 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 1,177 ​ ​ — ​ ​ 1,177 Managed Services ​ ​ 1,447 ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,447 Construction ​ ​ — ​ ​ 394 ​ ​ — ​ ​ — ​ ​ 394 Total Other Revenue ​ ​ 1,447 ​ ​ 394 ​ ​ 1,177 ​ ​ — ​ ​ 3,018 Total Revenue ​ ​ 82,465 ​ ​ 28,097 ​ ​ 1,177 ​ ​ — ​ ​ 111,739 Depreciation and amortization ​ 13,671 ​ 5,729 ​ 491 ​ 1,689 ​ 21,580 Non-cash stock-based compensation ​ 29 ​ — ​ 66 ​ 1,792 ​ 1,887 Operating income (loss) ​ 16,024 ​ 2,218 ​ (98) ​ (8,587) ​ 9,557 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 21,364 ​ $ 2,601 ​ $ — ​ $ — ​ $ 23,965 Fixed ​ ​ 55,845 ​ 4,304 ​ — ​ — ​ 60,149 Carrier Services ​ ​ 2,403 ​ ​ 25,988 ​ ​ — ​ ​ — ​ ​ 28,391 Other ​ 335 ​ ​ — ​ ​ — ​ ​ — ​ ​ 335 Total Communication Services Revenue ​ 79,947 ​ ​ 32,893 ​ ​ — ​ ​ — ​ ​ 112,840 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 1,438 ​ ​ — ​ ​ 1,438 Managed Services ​ ​ 1,338 ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 1,338 Total Other Revenue ​ ​ 1,338 ​ ​ — ​ ​ 1,438 ​ ​ — ​ ​ 2,776 Total Revenue ​ ​ 81,285 ​ ​ 32,893 ​ ​ 1,438 ​ ​ — ​ ​ 115,616 Depreciation and amortization ​ 14,089 ​ ​ 5,770 ​ ​ 1,016 ​ ​ 1,728 ​ 22,603 Non-cash stock-based compensation ​ 285 ​ ​ — ​ ​ — ​ ​ 1,263 ​ 1,548 Operating income (loss) ​ 10,867 ​ ​ 7,912 ​ ​ (714) ​ ​ (7,817) ​ 10,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Nine Months Ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 60,604 ​ $ 7,203 ​ $ — ​ $ — ​ $ 67,807 Fixed ​ ​ 172,420 ​ 15,181 ​ — ​ — ​ 187,601 Carrier Services ​ ​ 5,392 ​ ​ 60,779 ​ ​ — ​ ​ — ​ ​ 66,171 Other ​ 1,286 ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,286 Total Communication Services Revenue ​ 239,702 ​ ​ 83,163 ​ ​ — ​ ​ — ​ ​ 322,865 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 3,373 ​ ​ — ​ ​ 3,373 Managed Services ​ ​ 5,111 ​ ​ — ​ ​ — ​ ​ — ​ ​ 5,111 Construction ​ — ​ ​ 394 ​ ​ — ​ ​ — ​ ​ 394 Total Other Revenue ​ ​ 5,111 ​ ​ 394 ​ ​ 3,373 ​ ​ — ​ ​ 8,878 Total Revenue ​ ​ 244,813 ​ ​ 83,557 ​ ​ 3,373 ​ ​ — ​ ​ 331,743 Depreciation and amortization ​ 42,120 ​ ​ 17,331 ​ ​ 1,590 ​ ​ 5,048 ​ 66,089 Non-cash stock-based compensation ​ 20 ​ ​ — ​ ​ 197 ​ ​ 4,391 ​ 4,608 Operating income (loss) ​ 44,119 ​ ​ 6,241 ​ ​ (1,175) ​ ​ (25,306) ​ 23,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Nine Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 62,766 ​ $ 8,095 ​ $ — ​ $ — ​ $ 70,861 Fixed ​ ​ 166,925 ​ 9,885 ​ — ​ — ​ 176,810 Carrier Services ​ ​ 6,970 ​ ​ 62,820 ​ ​ — ​ ​ — ​ ​ 69,790 Other ​ 1,012 ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,012 Total Communication Services Revenue ​ 237,673 ​ ​ 80,800 ​ ​ — ​ ​ — ​ ​ 318,473 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 4,376 ​ ​ — ​ ​ 4,376 Managed Services ​ ​ 3,788 ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 3,788 Total Other Revenue ​ ​ 3,788 ​ ​ — ​ ​ 4,376 ​ ​ — ​ ​ 8,164 Total Revenue ​ ​ 241,461 ​ ​ 80,800 ​ ​ 4,376 ​ ​ — ​ ​ 326,637 Depreciation and amortization ​ 40,709 ​ ​ 16,919 ​ ​ 2,269 ​ ​ 4,973 ​ 64,870 Non-cash stock-based compensation ​ 306 ​ ​ — ​ ​ — ​ ​ 4,575 ​ 4,881 Operating income (loss) ​ 35,802 ​ ​ 5,927 ​ ​ (750) ​ ​ (25,862) ​ 15,117 ​ (1) Corporate and Other items refer to corporate overhead costs and consolidating adjustments Selected balance sheet data for each of the Company’s segments as of September 30, 2020 and December 31, 2019 consists of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash, Cash equivalents, and Investments ​ $ 67,701 ​ $ 25,177 ​ $ 22,376 ​ $ 20,302 ​ $ 135,556 Total current assets ​ ​ 124,515 ​ ​ 59,801 ​ ​ 25,290 ​ ​ 15,978 ​ ​ 225,584 Fixed assets, net ​ ​ 452,303 ​ ​ 77,017 ​ ​ 45,773 ​ ​ 14,335 ​ ​ 589,428 Goodwill ​ 25,421 ​ 35,270 ​ — ​ — ​ ​ 60,691 Total assets ​ 664,307 ​ 233,288 ​ 71,757 ​ 144,062 ​ ​ 1,113,414 Total current liabilities ​ ​ 71,254 ​ ​ 36,898 ​ ​ 909 ​ ​ 23,801 ​ ​ 132,862 Total debt ​ ​ 83,723 ​ ​ — ​ ​ — ​ ​ — ​ ​ 83,723 December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash, Cash equivalents, and Investments ​ $ 43,125 ​ $ 38,240 ​ $ 25,054 ​ $ 55,284 ​ $ 161,703 Total current assets ​ ​ 91,497 ​ ​ 54,207 ​ ​ 27,534 ​ ​ 55,485 ​ ​ 228,723 Fixed assets, net ​ ​ 466,523 ​ ​ 69,184 ​ ​ 48,421 ​ ​ 21,453 ​ ​ 605,581 Goodwill ​ 25,421 ​ 35,270 ​ — ​ — ​ ​ 60,691 Total assets ​ 647,228 ​ 222,356 ​ 76,723 ​ 184,419 ​ ​ 1,130,726 Total current liabilities ​ ​ 77,644 ​ ​ 24,905 ​ ​ 2,745 ​ ​ 14,375 ​ ​ 119,669 Total debt ​ ​ 86,426 ​ ​ — ​ ​ — ​ ​ — ​ ​ 86,426 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Capital Expenditures ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ ​ US ​ ​ Renewable ​ ​ Corporate and ​ ​ ​ Nine months ended September 30, ​ ​ Telecom ​ ​ Telecom ​ ​ Energy ​ ​ Other (1) ​ ​ Consolidated 2020 ​ $ 28,439 ​ $ 17,254 ​ $ 2,116 ​ $ 2,853 ​ $ 50,662 2019 ​ ​ 8,533 ​ ​ 33,159 ​ ​ 2,183 ​ ​ 5,611 ​ ​ 49,486 ​ (1) Corporate and other items refer to corporate overhead costs and consolidating adjustments

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2020
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	13. COMMITMENTS AND CONTINGENCIES ​ Regulatory and Litigation Matters ​ The Company and its subsidiaries are subject to certain regulatory and legal proceedings and other claims arising in the ordinary course of business, some of which involve claims for damages and taxes that are substantial in amount. The Company believes that, except for the items discussed below, for which the Company is currently unable to predict the final outcome, the disposition of proceedings currently pending will not have a material adverse effect on the Company’s financial position or results of operations. ​ In 1990, the Company’s Guyana subsidiary, GTT, was awarded a license to provide domestic and international voice and data services in Guyana on an exclusive basis until December 2030. Since 2001, the Government of Guyana has stated its intention to introduce additional competition into Guyana’s telecommunications sector. In connection therewith, the Company and GTT met on several occasions with officials of the Government of Guyana to discuss potential modifications of GTT’s exclusivity and other rights under the existing agreement and license. On October 5, 2020, the Prime Minister of Guyana formally implemented telecommunications legislation previously passed by the Guyana Parliament in 2016 that introduces material changes to many features of Guyana’s existing telecommunications regulatory regime with the intention of creating a more competitive market. At that time, the Company was issued a new license to provide domestic and international voice and data services and mobile services in Guyana, and two of its competitors were issued service licenses as well. The terms and conditions of the licenses have not yet been made public. While the Company has requested details of its competitors licenses, such information has not been made available by the Guyana Telecommunications Authority, and the Company is not yet able to ascertain whether the licenses issued to its competitors permit competitors to provide services that have been subject to GTT’s exclusive rights contained in its 1990 license ​ On October 23, 2020, the Government of Guyana brought into effect new telecommunications regulations called for by the telecommunications legislation. The regulations include new requirements on the market as a whole and the Company’s operations, administrative reporting and service requirements. There can be no assurance that these regulations will be effectively implemented, or that they will be administered in a fair and transparent manner. Under these circumstances, there can be no assurance that the Company’s discussions with the Government of Guyana will resume or be concluded, or that such discussions will satisfactorily address the Company’s contractual exclusivity rights. Although the Company believes that it would be entitled to damages or other compensation for any involuntary termination of its contractual exclusivity rights, it cannot guarantee that it would prevail in a proceeding to enforce its rights. ​ Historically, GTT has been subject to other long-standing litigation proceedings and disputes in Guyana that have not yet been resolved. The Company believes that none of these additional proceedings would, in the event of an adverse outcome, have a material impact on the Company’s consolidated financial position, results of operations or liquidity. ​ In a letter dated September 8, 2006, the National Frequency Management Unit (“NFMU”) agreed that total spectrum fees in Guyana should not increase for the years 2006 and 2007. However, that letter implied that spectrum fees in 2008 and onward may be increased beyond the amount GTT agreed to with the Government of Guyana. GTT has objected to the NFMU’s proposed action and reiterated its position that an increase in fees prior to development of an acceptable methodology would violate the Government’s prior agreement. In 2011, GTT paid the NFMU $2.6 million representing payments in full for 2008, 2009 and 2010. However, by letter dated November 23, 2011, the NFMU stated that it did not concur with GTT’s inference that the amount was payment in full for the specified years as it was NFMU’s continued opinion that the final calculation for spectrum fees was not agreed upon and was still an outstanding issue. By further letter dated November 24, 2011, the NFMU further rejected a proposal that was previously submitted jointly by GTT and another communications provider that outlined a recommended methodology for the calculation of these fees. The NFMU stated that it would prepare its own recommendation for consideration by the Minister of Telecommunications, who would decide the matter. GTT has paid undisputed spectrum fees according to the methodology used for its 2011 payments, and has reserved amounts payable according to this methodology. There have been limited further discussions on this subject and GTT has not had the opportunity to review any recommendation made by the NFMU to the Minister. ​ On May 8, 2009, a GTT competitor, Digicel, filed a lawsuit in Guyana challenging the legality of GTT’s exclusive license rights under Guyana’s constitution and GTT intervened in the suit in order to oppose Digicel’s claims. The case remains pending. The Company believes that any legal challenge to GTT’s exclusive license rights granted in 1990 is without merit and the Company intends to defend vigorously against such legal challenge. ​ GTT has filed several lawsuits in the High Court of Guyana asserting that, despite its denials, Digicel is engaged in international bypass in violation of GTT’s exclusive license rights, the interconnection agreement between the parties, and the laws of Guyana. GTT is seeking injunctive relief to stop the illegal bypass activity and monetary damages. Digicel filed counterclaims alleging that GTT has violated the terms of the interconnection agreement and Guyana laws. These suits, in 2010 and 2012, have been consolidated Digicel’s constitutional challenge described above. Prior to the declaration of COVID-19 related travel and business restrictions in Guyana, the consolidated cases were scheduled to proceed to in 2020 . GTT is also involved in several legal claims regarding its tax filings with the Guyana Revenue Authority dating back to 1991 regarding the deductibility of intercompany advisory fees as well as other tax assessments. The Company maintains that any liability GTT might be found to have with respect to the disputed tax assessments that the Guyana Revenue Authority has alleged total $44.1 million, would be offset in part by the amounts necessary to ensure that GTT’s return on investment was no less than 15% per annum for the relevant periods. The Company believes that some adverse outcome is probable and has accordingly accrued $5.0 million as of September 30, 2020 for these matters. ​

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	9 Months Ended
	Sep. 30, 2020
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	14. SUBSEQUENT EVENTS ​ Changes in Guyana Telecommunications Legislation ​ On October 5, 2020, the Prime Minister of Guyana formally implemented telecommunications legislation previously passed by the Guyana Parliament in 2016 that introduces material changes to many features of Guyana’s existing telecommunications regulatory regime with the intention of creating a more competitive market. See Note 13 for additional details. ​ Increase in the ownership of One Communications, Ltd. In October 2020, the Company completed a transaction to increase its equity ownership in One Communications, its subsidiary based in Bermuda and the Cayman Islands. Subsequent to the private transaction, which involved the Company’s acquisition of equity from another shareholder for cash, the Company owns approximately 70% of One Communications.

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	9 Months Ended
	Sep. 30, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation	The accompanying condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). The financial information included herein is unaudited; however, the Company believes such information and the disclosures herein are adequate to make the information presented not misleading and reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company’s financial position and results of operations for the periods described therein. The year-end condensed balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Results of interim periods may not be indicative of results for the full year. These condensed consolidated financial statements and related notes should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on March 2, 2020, ​ The condensed consolidated financial statements include the accounts of the Company, its subsidiaries in which the Company holds controlling interests and certain entities which are consolidated in accordance with the provisions of the Financial Accounting Standards Board’s (“FASB”) authoritative guidance on the consolidation of variable interest entities, since it is determined that the Company is the primary beneficiary of these entities. ​ Presentation of Revenue ​ Effective January 1, 2020, the Company changed its presentation of revenue in the Condensed Consolidated Statement of Operations and in the Selected Segment Financial Information tables. This change is intended to better align the Company’s financial performance with the views of management and industry competitors, and to facilitate a more constructive dialogue with the investment community. ​ Specifically, the previously disclosed revenue categories of wireless and wireline revenue are being represented as mobility, fixed and carrier services revenue within the Company’s segment information and are included within communications services revenue within its Statements of Operations. Managed services revenue, which was previously a component of wireline revenue, along with revenue from the Company’s Renewable Energy operations, is now included in other revenue. Construction revenue is also included as a component of other revenue. ​
Recent Accounting Pronouncements	Recent Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” and subsequently issued related updates (“ASU 2016-02”), which provide comprehensive lease accounting guidance. The standard requires entities to recognize lease assets and liabilities on the balance sheet as well as disclosure of key information about leasing arrangements. ASU 2016-02 became effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The Company adopted ASC 2016-02 on January 1, 2019 utilizing the optional transition method with a cumulative adjustment on the date of adoption and not adjusting prior periods. Refer to Note 4 of the Condensed Consolidated Financial Statements. ​ In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815) – Targeted Improvements to Accounting for Hedging Activities” (“ASU 2017-12”). The standard: (a) expands and refines hedge accounting for both financial and non-financial risk components, (b) aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and (c) includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The guidance is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company adopted this standard on January 1, 2019. There was not a material impact to the Company’s Consolidated Financial Statements upon adoption. ​ In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). ASU 2016-13 requires entities to use a new forward-looking, expected loss model to estimate credit losses. It also requires additional disclosure relating to the credit quality of trade and other receivables, including information relating to management’s estimate of credit allowances. The Company adopted ASU 2016-13 using the modified retrospective approach on its January 1, 2020 effective date. Refer to Note 3 of the Condensed Consolidated Financial Statements in this Report.

ORGANIZATION AND BUSINESS OPE_2

ORGANIZATION AND BUSINESS OPERATIONS (Tables)	9 Months Ended
	Sep. 30, 2020
ORGANIZATION AND BUSINESS OPERATIONS
Schedule of the operating activities of the Company's principal subsidiaries, the segments in which the Company reports its revenue and markets served	​ ​ ​ ​ ​ ​ ​ ​ ​ Segment Services Markets Tradenames International Telecom Mobility Bermuda, Guyana, US Virgin Islands GTT+, One, Viya ​ ​ Fixed Bermuda, Cayman Islands, Guyana, US Virgin Islands GTT+, One, Logic, Viya ​ ​ ​ Carrier Services ​ Bermuda, Guyana, US Virgin Islands ​ GTT+, One, Viya ​ ​ ​ Managed Services ​ Bermuda, Cayman Islands, US Virgin Islands, Guyana ​ Fireminds, One, Logic, Viya, GTT+ ​ US Telecom Mobility United States (rural markets) Commnet, Choice, Choice NTUA Wireless, WestNet, Geoverse ​ ​ ​ Fixed ​ United States ​ Commnet, Choice, Choice NTUA Wireless, Deploycom, WestNet ​ ​ ​ Carrier Services ​ United States ​ Commnet, Essextel ​ ​ Managed Services United States Choice ​ Renewable Energy ​ Solar ​ India ​ Vibrant Energy ​

REVENUE RECOGNITION AND RECEI_2

REVENUE RECOGNITION AND RECEIVABLES (Tables)	9 Months Ended
	Sep. 30, 2020
REVENUE RECOGNITION AND RECEIVABLES
Summary of contracts asset and liabilities	​ Contract assets and liabilities consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ December 31, 2019 ​ ​ $ Change ​ % Change Contract asset – current $ 2,269 ​ $ 2,413 ​ $ (144) ​ (6) % Contract asset – noncurrent ​ 699 ​ ​ 905 ​ ​ (206) ​ (23) % Contract liability – current ​ (16,338) ​ ​ (15,044) ​ ​ (1,294) ​ (9) % Contract liability – noncurrent ​ (2,486) ​ ​ (5,450) ​ ​ 2,964 ​ 54 % Net contract liability $ (15,856) ​ $ (17,176) ​ $ 1,320 ​ 8 %
Schedule of activity in allowances for credit losses	​ ​ ​ ​ ​ ​ Nine months ended September 30, 2020 ​ ​ ​ ​ Balance at January 1, 2020 $ 12,724 Current period provision for expected losses ​ 4,452 Write-offs charged against the allowance ​ (5,434) Recoveries collected ​ ​ 466 Balance at September 30, 2020 ​ $ 12,208

LEASES (Tables)

LEASES (Tables)	9 Months Ended
	Sep. 30, 2020
LEASES
Summary of components of lease expense	The components of lease expense were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ Three months ended September 30, 2019 ​ Nine months ended September 30, 2020 ​ Nine months ended September 30, 2019 Operating lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease cost $ 4,152 ​ $ 3,627 ​ $ 12,228 ​ $ 11,294 Short-term lease cost ​ 769 ​ ​ 652 ​ ​ 2,040 ​ ​ 2,232 Variable lease cost ​ 692 ​ ​ 1,151 ​ ​ 3,034 ​ ​ 2,400 Total operating lease cost $ 5,613 ​ $ 5,430 ​ $ 17,302 ​ $ 15,926 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Finance lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortization of right-of-use asset $ 534 ​ $ 570 ​ $ 1,628 ​ $ 1,749 Variable costs ​ 198 ​ ​ 244 ​ ​ 655 ​ ​ 802 Total finance lease cost $ 732 ​ $ 814 ​ $ 2,283 ​ $ 2,551
Summary of weighted-average remaining lease term and discount rate	The weighted average remaining lease terms and discount rates as of September 30, 2020 and December 31, 2019 are noted in the table below: ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ December 31, 2019 Weighted-average remaining lease term ​ ​ ​ ​ ​ Operating leases ​ 6.0 years ​ ​ 6.5 years Financing leases ​ 10.5 years ​ ​ 11.7 years ​ ​ ​ ​ ​ ​ Weighted-average discount rate ​ ​ ​ ​ ​ Operating leases ​ 5.0% ​ ​ 5.0% Financing leases ​ 3.3% ​ ​ n/a
Summary of maturities of lease liabilities	Maturities of lease liabilities as of September 30, 2020 were as follows (in thousands): ​ ​ ​ ​ ​ Operating Leases 2020 (excluding the nine months ended September 30, 2020) $ 3,014 2021 ​ 15,761 2022 ​ 14,170 2023 ​ 11,789 2024 ​ 10,466 Thereafter ​ 19,885 Total lease payments ​ 75,085 Less imputed interest ​ (10,640) Total $ 64,445 ​ Maturities of lease liabilities as of December 31, 2019 were as follows (in thousands): ​ ​ ​ ​ ​ Operating Leases 2020 $ 14,526 2021 ​ 13,714 2022 ​ 12,787 2023 ​ 10,713 2024 ​ 9,671 Thereafter ​ 18,354 Total lease payments ​ 79,765 Less imputed interest ​ (12,195) Total $ 67,570

FAIR VALUE MEASUREMENTS AND I_2

FAIR VALUE MEASUREMENTS AND INVESTMENTS (Tables)	9 Months Ended
	Sep. 30, 2020
FAIR VALUE MEASUREMENTS AND INVESTMENTS
Schedule of assets and liabilities of the entity measured at fair value on a recurring basis	Assets and liabilities of the Company measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019 are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ Significant Other ​ ​ Quoted Prices in ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Active Markets ​ Inputs ​ Inputs ​ ​ ​ Description ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Total Certificates of deposit ​ $ — ​ $ 380 ​ $ — ​ $ 380 Money market funds ​ ​ 2,450 ​ ​ — ​ ​ — ​ ​ 2,450 Short term investments ​ ​ 403 ​ ​ — ​ ​ — ​ ​ 403 Other investments ​ ​ — ​ ​ — ​ ​ 13,172 ​ ​ 13,172 Interest rate swap ​ ​ — ​ ​ (189) ​ ​ — ​ ​ (189) Total assets and liabilities measured at fair value ​ $ 2,853 ​ $ 191 ​ $ 13,172 ​ $ 16,216 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Significant Other ​ ​ ​ Quoted Prices in ​ Observable ​ Unobservable ​ ​ ​ ​ ​ ​ Active Markets ​ Inputs ​ Inputs ​ ​ ​ ​ Description ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ Total Certificates of deposit ​ $ — ​ $ 380 ​ $ — ​ $ 380 ​ Money market funds ​ ​ 2,329 ​ ​ — ​ ​ — ​ ​ 2,329 ​ Short term investments ​ ​ 416 ​ ​ — ​ ​ — ​ ​ 416 ​ Other investments ​ ​ — ​ ​ — ​ ​ 12,700 ​ ​ 12,700 ​ Interest rate swap ​ ​ — ​ ​ (56) ​ ​ — ​ ​ (56) ​ Total assets and liabilities measured at fair value ​ $ 2,745 ​ $ 324 ​ $ 12,700 ​ $ 15,769 ​

RETIREMENT PLANS (Tables)

RETIREMENT PLANS (Tables)	9 Months Ended
	Sep. 30, 2020
RETIREMENT PLANS
Schedule of components of the plan's net periodic pension cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ ​ September 30, 2020 September 30, 2019 ​ ​ ​ Pension benefits ​ Postretirement benefits ​ Pension benefits ​ Postretirement benefits ​ Operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost ​ $ (164) ​ $ 32 ​ $ 447 ​ $ 37 ​ Non-operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest cost ​ ​ 603 ​ ​ 45 ​ ​ 841 ​ ​ 40 ​ Expected return on plan assets ​ (414) ​ — ​ ​ (1,263) ​ — ​ Actuarial (gain)/ loss ​ ​ (7) ​ ​ (15) ​ ​ 7 ​ ​ (17) ​ Net periodic pension expense ​ $ 18 ​ $ 62 ​ $ 32 ​ $ 60 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended ​ ​ ​ September 30, 2020 September 30, 2019 ​ ​ ​ Pension benefits ​ Postretirement benefits ​ Pension benefits ​ Postretirement benefits ​ Operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service cost ​ $ 682 ​ $ 96 ​ $ 1,342 ​ $ 111 ​ Non-operating expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest cost ​ ​ 2,361 ​ ​ 135 ​ ​ 2,524 ​ ​ 120 ​ Expected return on plan assets ​ (2,730) ​ — ​ (3,790) ​ — ​ Actuarial (gain)/ loss ​ ​ (21) ​ ​ (45) ​ ​ 22 ​ ​ (51) ​ Net periodic pension expense ​ $ 292 ​ $ 186 ​ $ 98 ​ $ 180 ​

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	9 Months Ended
	Sep. 30, 2020
SEGMENT REPORTING
Schedule of information for each operating segment	The following tables provide information for each operating segment (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 21,406 ​ $ 2,432 ​ $ — ​ $ — ​ $ 23,838 Fixed ​ ​ 57,364 ​ 5,419 ​ — ​ — ​ 62,783 Carrier Services ​ ​ 1,851 ​ ​ 19,852 ​ ​ — ​ ​ — ​ ​ 21,703 Other ​ 397 ​ ​ — ​ ​ — ​ ​ — ​ ​ 397 Total Communication Services Revenue ​ 81,018 ​ ​ 27,703 ​ ​ — ​ ​ — ​ ​ 108,721 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 1,177 ​ ​ — ​ ​ 1,177 Managed Services ​ ​ 1,447 ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,447 Construction ​ ​ — ​ ​ 394 ​ ​ — ​ ​ — ​ ​ 394 Total Other Revenue ​ ​ 1,447 ​ ​ 394 ​ ​ 1,177 ​ ​ — ​ ​ 3,018 Total Revenue ​ ​ 82,465 ​ ​ 28,097 ​ ​ 1,177 ​ ​ — ​ ​ 111,739 Depreciation and amortization ​ 13,671 ​ 5,729 ​ 491 ​ 1,689 ​ 21,580 Non-cash stock-based compensation ​ 29 ​ — ​ 66 ​ 1,792 ​ 1,887 Operating income (loss) ​ 16,024 ​ 2,218 ​ (98) ​ (8,587) ​ 9,557 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 21,364 ​ $ 2,601 ​ $ — ​ $ — ​ $ 23,965 Fixed ​ ​ 55,845 ​ 4,304 ​ — ​ — ​ 60,149 Carrier Services ​ ​ 2,403 ​ ​ 25,988 ​ ​ — ​ ​ — ​ ​ 28,391 Other ​ 335 ​ ​ — ​ ​ — ​ ​ — ​ ​ 335 Total Communication Services Revenue ​ 79,947 ​ ​ 32,893 ​ ​ — ​ ​ — ​ ​ 112,840 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 1,438 ​ ​ — ​ ​ 1,438 Managed Services ​ ​ 1,338 ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 1,338 Total Other Revenue ​ ​ 1,338 ​ ​ — ​ ​ 1,438 ​ ​ — ​ ​ 2,776 Total Revenue ​ ​ 81,285 ​ ​ 32,893 ​ ​ 1,438 ​ ​ — ​ ​ 115,616 Depreciation and amortization ​ 14,089 ​ ​ 5,770 ​ ​ 1,016 ​ ​ 1,728 ​ 22,603 Non-cash stock-based compensation ​ 285 ​ ​ — ​ ​ — ​ ​ 1,263 ​ 1,548 Operating income (loss) ​ 10,867 ​ ​ 7,912 ​ ​ (714) ​ ​ (7,817) ​ 10,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Nine Months Ended September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 60,604 ​ $ 7,203 ​ $ — ​ $ — ​ $ 67,807 Fixed ​ ​ 172,420 ​ 15,181 ​ — ​ — ​ 187,601 Carrier Services ​ ​ 5,392 ​ ​ 60,779 ​ ​ — ​ ​ — ​ ​ 66,171 Other ​ 1,286 ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,286 Total Communication Services Revenue ​ 239,702 ​ ​ 83,163 ​ ​ — ​ ​ — ​ ​ 322,865 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 3,373 ​ ​ — ​ ​ 3,373 Managed Services ​ ​ 5,111 ​ ​ — ​ ​ — ​ ​ — ​ ​ 5,111 Construction ​ — ​ ​ 394 ​ ​ — ​ ​ — ​ ​ 394 Total Other Revenue ​ ​ 5,111 ​ ​ 394 ​ ​ 3,373 ​ ​ — ​ ​ 8,878 Total Revenue ​ ​ 244,813 ​ ​ 83,557 ​ ​ 3,373 ​ ​ — ​ ​ 331,743 Depreciation and amortization ​ 42,120 ​ ​ 17,331 ​ ​ 1,590 ​ ​ 5,048 ​ 66,089 Non-cash stock-based compensation ​ 20 ​ ​ — ​ ​ 197 ​ ​ 4,391 ​ 4,608 Operating income (loss) ​ 44,119 ​ ​ 6,241 ​ ​ (1,175) ​ ​ (25,306) ​ 23,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Nine Months Ended September 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated Revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Communication Services ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mobility ​ $ 62,766 ​ $ 8,095 ​ $ — ​ $ — ​ $ 70,861 Fixed ​ ​ 166,925 ​ 9,885 ​ — ​ — ​ 176,810 Carrier Services ​ ​ 6,970 ​ ​ 62,820 ​ ​ — ​ ​ — ​ ​ 69,790 Other ​ 1,012 ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,012 Total Communication Services Revenue ​ 237,673 ​ ​ 80,800 ​ ​ — ​ ​ — ​ ​ 318,473 Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Renewable Energy ​ ​ — ​ ​ — ​ ​ 4,376 ​ ​ — ​ ​ 4,376 Managed Services ​ ​ 3,788 ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 3,788 Total Other Revenue ​ ​ 3,788 ​ ​ — ​ ​ 4,376 ​ ​ — ​ ​ 8,164 Total Revenue ​ ​ 241,461 ​ ​ 80,800 ​ ​ 4,376 ​ ​ — ​ ​ 326,637 Depreciation and amortization ​ 40,709 ​ ​ 16,919 ​ ​ 2,269 ​ ​ 4,973 ​ 64,870 Non-cash stock-based compensation ​ 306 ​ ​ — ​ ​ — ​ ​ 4,575 ​ 4,881 Operating income (loss) ​ 35,802 ​ ​ 5,927 ​ ​ (750) ​ ​ (25,862) ​ 15,117 ​ (1) Corporate and Other items refer to corporate overhead costs and consolidating adjustments
Schedule of segment balance sheet data and capital expenditures	Selected balance sheet data for each of the Company’s segments as of September 30, 2020 and December 31, 2019 consists of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ US ​ Renewable ​ Corporate and ​ ​ ​ ​ ​ Telecom ​ Telecom ​ Energy ​ Other (1) ​ Consolidated September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash, Cash equivalents, and Investments ​ $ 67,701 ​ $ 25,177 ​ $ 22,376 ​ $ 20,302 ​ $ 135,556 Total current assets ​ ​ 124,515 ​ ​ 59,801 ​ ​ 25,290 ​ ​ 15,978 ​ ​ 225,584 Fixed assets, net ​ ​ 452,303 ​ ​ 77,017 ​ ​ 45,773 ​ ​ 14,335 ​ ​ 589,428 Goodwill ​ 25,421 ​ 35,270 ​ — ​ — ​ ​ 60,691 Total assets ​ 664,307 ​ 233,288 ​ 71,757 ​ 144,062 ​ ​ 1,113,414 Total current liabilities ​ ​ 71,254 ​ ​ 36,898 ​ ​ 909 ​ ​ 23,801 ​ ​ 132,862 Total debt ​ ​ 83,723 ​ ​ — ​ ​ — ​ ​ — ​ ​ 83,723 December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash, Cash equivalents, and Investments ​ $ 43,125 ​ $ 38,240 ​ $ 25,054 ​ $ 55,284 ​ $ 161,703 Total current assets ​ ​ 91,497 ​ ​ 54,207 ​ ​ 27,534 ​ ​ 55,485 ​ ​ 228,723 Fixed assets, net ​ ​ 466,523 ​ ​ 69,184 ​ ​ 48,421 ​ ​ 21,453 ​ ​ 605,581 Goodwill ​ 25,421 ​ 35,270 ​ — ​ — ​ ​ 60,691 Total assets ​ 647,228 ​ 222,356 ​ 76,723 ​ 184,419 ​ ​ 1,130,726 Total current liabilities ​ ​ 77,644 ​ ​ 24,905 ​ ​ 2,745 ​ ​ 14,375 ​ ​ 119,669 Total debt ​ ​ 86,426 ​ ​ — ​ ​ — ​ ​ — ​ ​ 86,426 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Capital Expenditures ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ International ​ ​ US ​ ​ Renewable ​ ​ Corporate and ​ ​ ​ Nine months ended September 30, ​ ​ Telecom ​ ​ Telecom ​ ​ Energy ​ ​ Other (1) ​ ​ Consolidated 2020 ​ $ 28,439 ​ $ 17,254 ​ $ 2,116 ​ $ 2,853 ​ $ 50,662 2019 ​ ​ 8,533 ​ ​ 33,159 ​ ​ 2,183 ​ ​ 5,611 ​ ​ 49,486 ​ (1) Corporate and other items refer to corporate overhead costs and consolidating adjustments

ORGANIZATION AND BUSINESS OPE_3

ORGANIZATION AND BUSINESS OPERATIONS (Details)	9 Months Ended
	Sep. 30, 2020segment
ORGANIZATION AND BUSINESS OPERATIONS
Number of Operating Segments	3

REVENUE RECOGNITION AND RECEI_3

REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Contract Assets and Liabilities
Contract Asset - current		$ 2,413
Change in contract asset - current		(144)
Contract Asset - current	$ 2,269	$ 2,269
% of change in contract asset - current		(6.00%)
Contract asset, noncurrent		$ 905
Change in contract asset - noncurrent		(206)
Contract asset, noncurrent	699	$ 699
% of change in contract asset - noncurrent		(23.00%)
Contract liability- current		$ (15,044)
Change in contract liabilities - current		(1,294)
Contract liability- current	(16,338)	$ (16,338)
% of change in contract liabilities - current		(9.00%)
Contract liability- noncurrent		$ (5,450)
Change in contract liabilities - noncurrent		2,964
Contract liability- noncurrent	(2,486)	$ (2,486)
% of change in contract liabilities - Noncurrent		54.00%
Net contract liability		$ (17,176)
Change in net contract liability		1,320
Net contract liability	(15,856)	$ (15,856)
% of change in net contract liability		8.00%
Revenue recognized related to contract liability		$ 15,000
Amortization of contract assets	$ 500	1,900
Revenue recognized in the period related to performance obligations that were satisfied or partially satisfied in previous periods		$ 0
Retail revenue period for billing postpaid customers in advance		1 month

REVENUE RECOGNITION AND RECEI_4

REVENUE RECOGNITION AND RECEIVABLES - Contract Acquisition Costs (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2020USD ($)
Contract Acquisition Costs
Amortization of contract acquisition cost	$ 500	$ 1,500
Prepayments and other current assets
Contract Acquisition Costs
Short-term contract acquisition costs	1,800	1,800
Other Assets
Contract Acquisition Costs
Long-term contract acquisition costs	$ 1,100	$ 1,100

REVENUE RECOGNITION AND RECEI_5

REVENUE RECOGNITION AND RECEIVABLES - Remaining Performance Obligations - (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Revenue Recognition
Transaction price allocated to unsatisfied performance obligations		$ 241
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue Recognition
Transaction price allocated to unsatisfied performance obligations	$ 321
Period to satisfy the remaining performance obligations and recognize the transaction price	24 months
Right to invoice and wholly unsatisfied performance obligation practical expedients	true

REVENUE RECOGNITION AND RECEI_6

REVENUE RECOGNITION AND RECEIVABLES - Allowance for Credit Losses - (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Allowance for Credit Loss
Total equity	$ 794,598	$ 797,643	$ 806,083	$ 818,299	$ 818,541	$ 823,324
Gross accounts receivable	55,700		48,600
Accounts receivable allowance	$ 12,200		12,700
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Loss
Total equity			$ 0

REVENUE RECOGNITION AND RECEI_7

REVENUE RECOGNITION AND RECEIVABLES - Allowance for Credit Losses Rollforward - (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
REVENUE RECOGNITION AND RECEIVABLES
Beginning Balance	$ 12,724
Current period provision for expected losses	4,452	$ 3,796
Write-offs charged against the allowance	(5,434)
Recoveries collected	466
Ending Balance	$ 12,208

LEASES - Narrative (Details)

LEASES - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
LEASES
Operating lease right-of-use asset	$ 64,294		$ 68,763
Short-term lease liability	10,902		11,406
Long-term lease liability	53,543		56,164
Total equity	$ 794,598	$ 797,643	$ 806,083	$ 818,299	$ 818,541	$ 823,324
Package of practical expedients	true
ASC 842 | Cumulative Effect, Period of Adoption, Adjustment
LEASES
Operating lease right-of-use asset						70,800
Short-term lease liability						8,200
Long-term lease liability						61,200
Total equity						$ 0
Minimum
LEASES
Operating lease, lease term	3 years
Finance lease, lease term	3 years
Maximum
LEASES
Operating lease, lease term	10 years
Finance lease, lease term	10 years

LEASES - Components of Lease Ex

LEASES - Components of Lease Expense and Payments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
LEASES
Operating lease cost	$ 4,152	$ 3,627	$ 12,228	$ 11,294
Short-term lease cost	769	652	2,040	2,232
Variable lease cost	692	1,151	3,034	2,400
Total operating lease cost	5,613	5,430	17,302	15,926
Payments for lease liabilities			9,100	10,200
Lease liabilities arising from right-of-use assets			5,700	7,300
Finance lease cost:
Amortization of right-of-use asset	534	570	1,628	1,749
Variable costs	198	244	655	802
Total finance lease cost	732	$ 814	2,283	$ 2,551
Finance leases cost included in property, plant and equipment	$ 25,200		$ 25,200		$ 25,900
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentGross		us-gaap:PropertyPlantAndEquipmentGross		us-gaap:PropertyPlantAndEquipmentGross
Principal payments, finance lease liabilities			$ 600
Finance Lease Liabilities Recognized			1,500
Finance lease liability	$ 1,300		1,300
Finance Lease, Liability, Current	300		300
Accumulated depreciation related to finance leases	$ 9,000		$ 9,000		$ 9,400

LEASES - Weighted average remai

LEASES - Weighted average remaining lease terms and discount rates (Details)	Sep. 30, 2020	Dec. 31, 2019
LEASES
Operating leases, weighted average remaining lease term	6 years	6 years 6 months
Financing leases, weighted average remaining lease term	10 years 6 months	11 years 8 months 12 days
Operating leases, weighted average discount rate	5.00%	5.00%
Financing leases, weighted average discount rate	3.30%

LEASES - Maturities of lease li

LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
LEASES
2020 (excluding the nine months ended September 30, 2020)	$ 3,014
Next Twelve Months	15,761	$ 14,526
Year Two	14,170	13,714
Year Three	11,789	12,787
Year Four	10,466	10,713
Thereafter	19,885
Year Five		9,671
Thereafter		18,354
Total lease payments	75,085	79,765
Less imputed interest	(10,640)	(12,195)
Total	$ 64,445	$ 67,570
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent

FAIR VALUE MEASUREMENTS AND I_3

FAIR VALUE MEASUREMENTS AND INVESTMENTS - Recurring (Details) - Recurring basis - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair value measurements
Total assets and liabilities measured at fair value	$ 16,216	$ 15,769
Certificate of deposit
Fair value measurements
Cash and cash equivalents	380	380
Money market funds
Fair value measurements
Cash and cash equivalents	2,450	2,329
Short Term Investments
Fair value measurements
Cash and cash equivalents	403
Investments		416
Other investments
Fair value measurements
Investments	13,172	12,700
Interest rate swap
Fair value measurements
Derivative liabilities	(189)	(56)
Level 1
Fair value measurements
Total assets and liabilities measured at fair value	2,853	2,745
Level 1 | Money market funds
Fair value measurements
Cash and cash equivalents	2,450	2,329
Level 1 | Short Term Investments
Fair value measurements
Cash and cash equivalents	403
Investments		416
Level 2
Fair value measurements
Total assets and liabilities measured at fair value	191	324
Level 2 | Certificate of deposit
Fair value measurements
Cash and cash equivalents	380	380
Level 2 | Interest rate swap
Fair value measurements
Derivative liabilities	(189)	(56)
Level 3
Fair value measurements
Total assets and liabilities measured at fair value	13,172	12,700
Level 3 | Other investments
Fair value measurements
Investments	$ 13,172	$ 12,700

FAIR VALUE MEASUREMENTS AND I_4

FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair value measurements
Loss as a result of an observable price change in investment	$ 800
Loss on equity investments				$ 3,360	$ 2,131
Privately Held Investment
Fair value measurements
Payments to acquire equity method investment		$ 2,800		2,800
Ownership percentage		24.00%
Increase in carrying value of equity method investment				1,500
Loss on equity investments				1,500
Currency gains				200
Other Assets | Privately Held Investment
Fair value measurements
Carrying value	17,000			17,000		$ 15,500
Short Term Investments
Fair value measurements
Equity investments	100			100		200
Loss (gain) on equity securities			$ 0	100	$ 0
Other investments
Fair value measurements
Equity investments	10,800			10,800
Unrealized (loss) gain	(100)			600
Other investments | Renewable energy partnership
Fair value measurements
Payments to acquire equity method investment			$ 14,400
Investment Tax Credit	12,000
Equity investments	2,400			2,400		2,500
Carrying Value
Fair value measurements
Long-term debt	83,700			83,700		86,400
Carrying Value | Other Assets
Fair value measurements
Strategic investments	1,300			1,300		2,100
Level 2 | Estimated Fair Value
Fair value measurements
Long-term debt	$ 84,200			$ 84,200		$ 86,900

LONG-TERM DEBT (Details)

LONG-TERM DEBT (Details) $ in Thousands	Mar. 26, 2020USD ($)	Apr. 10, 2019USD ($)	May 22, 2017USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jul. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jul. 01, 2016USD ($)
Long-term debt
Outstanding borrowings				$ 83,723	$ 86,426
One Communications Debt
Long-term debt
Financing costs			$ 300
Outstanding debt				24,300
Unamortized financing costs				100
One Communications Debt | Minimum
Long-term debt
Percentage of notional amount required for hedging arrangement			30.00%
One Communications Debt | Minimum | One-month LIBOR
Long-term debt
Basis spread on variable rate (as a percent)			2.50%
One Communications Debt | Maximum | One-month LIBOR
Long-term debt
Basis spread on variable rate (as a percent)			2.75%
Viya Debt
Long-term debt
Term loan assumed									$ 60,000
Net leverage ratio									3.5
Stated interest rate								4.00%	4.00%
Financing costs								$ 900
Intercompany debt limit						$ 75,000
Outstanding debt				60,000
Unamortized financing costs				500
Revolver loan | Credit facility
Long-term debt
Maximum borrowing capacity		$ 200,000
Remaining borrowing capacity				184,000
Net leverage ratio		1.75
Net leverage ratio, if qualifying event		3.25
Revolver loan | Credit facility | Minimum
Long-term debt
Commitment fee (as a percent)		0.15%
Revolver loan | Credit facility | Minimum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)		1.25%
Revolver loan | Credit facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)		0.25%
Revolver loan | Credit facility | Maximum
Long-term debt
Commitment fee (as a percent)		0.375%
Net leverage ratio		2.75
Revolver loan | Credit facility | Maximum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)		2.25%
Revolver loan | Credit facility | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)		1.25%
Letter of credit sub-facility | Credit facility
Long-term debt
Maximum borrowing capacity		$ 75,000
Performance letters of credit issued and outstanding				16,000
Swingline sub-facility | Credit facility
Long-term debt
Maximum borrowing capacity		$ 10,000
Base rate before one-week or one-month LIBOR (as a percent)		1.00%
Swingline sub-facility | Credit facility | Federal Funds Effective Rate
Long-term debt
Basis spread on variable rate (as a percent)		0.50%
Commnet Finance | Senior secured delayed draw term loan | Receivable credit facility
Long-term debt
Maximum borrowing capacity	$ 75,000
Outstanding borrowings				0
Commnet Finance | Senior secured delayed draw term loan | Receivable credit facility | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)	2.50%
Commnet Finance | Senior secured delayed draw term loan | Receivable credit facility | Base rate
Long-term debt
Basis spread on variable rate (as a percent)	1.50%
Cash flow hedge | Interest rate swap
Long-term debt
Notional amount				$ 7,600			$ 11,000
Interest rate (as a percent)							1.874%

GOVERNMENT GRANTS (Details)

GOVERNMENT GRANTS (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2018USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)MWitem	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Government Grants
Revenue		$ 111,739	$ 115,616	$ 331,743	$ 326,637
Payment for PALs				$ 20,396
Universal Service Fund programs
Government Grants
Number of fund disbursement programs | item				4
High-Cost Support Program | US Telecom
Government Grants
Revenue		300	300	$ 900	900
High-Cost Support Program | International Telecom
Government Grants
Revenue		4,100	4,100	12,300	12,300
E-Rate, Lifeline and Rural Health Care Support Programs
Government Grants
Revenue		2,200	1,500	6,600	4,700
Network Connectivity for Eligible Communities
Government Grants
Grant Funds Awarded				16,800
Proceeds from completion of construction				$ 0		$ 5,400
Reimbursement of capital expenditures						3,100
Offsetting operating activities						$ 2,300
Tribal Bidding Credit
Government Grants
Wireless service spectrum (in Mhz) | MW				600
Revenue							$ 7,400
Grant funds used to offset fixed asset related costs		5,400		$ 5,400
Grant funds used to offset operating expenses		2,000		2,000
Offsetting operating activities				100
Amount spent on capital expenditure				5,100
Connect America Fund Phase II Auction
Government Grants
Revenue		$ 1,900	$ 1,900	$ 5,700	$ 3,400
Grant Funds Awarded	$ 79,900
Grant fund term	10 years
CBRS Auction
Government Grants
Initial term of licenses		10 years
Payment for PALs		$ 20,400

RETIREMENT PLANS - Net Periodic

RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Pension Plans
Components of the plan's net periodic pension cost
Service cost	$ (164)	$ 447	$ 682	$ 1,342
Interest cost	603	841	2,361	2,524
Expected return on plan assets	(414)	(1,263)	(2,730)	(3,790)
Actuarial (gain)/ loss	(7)	7	(21)	22
Net periodic pension expense	18	32	292	98
Company contributions			700	300
Funded status of plan
Plan Net Assets					$ 15,100
Projected benefit obligation					$ 15,600
Postretirement Benefits
Components of the plan's net periodic pension cost
Service cost	32	37	96	111
Interest cost	45	40	135	120
Actuarial (gain)/ loss	(15)	(17)	(45)	(51)
Net periodic pension expense	$ 62	$ 60	$ 186	$ 180

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
INCOME TAXES
Effective tax rate (as a percent)	1.50%	27.50%	(6.70%)	26.70%
Income tax benefit from investment tax credit		$ 1.3		$ 1.3
Benefit from the reversal of unrecognized tax positions due to statute expiration			$ 2.9
Income Tax Benefit, Utilization of Losses at Higher Rate, Coronavirus Aid, Relief, and Economic Security Act	$ 0.6		1
Interest on unrecognized tax position	0.4	$ 0.5	1.4
Income tax benefit from reversal of deferred tax liability due to intercompany debt restructure				$ 0.5
Change in valuation allowance	$ 0.2		$ 0.6

NET INCOME (LOSS) PER SHARE (De

NET INCOME (LOSS) PER SHARE (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Anti-dilutive common shares not included for computation of earnings per share
Anti-dilutive potential shares excluded from the computation of diluted weighted average shares outstanding (in shares)	38,564
Stock options
Anti-dilutive common shares not included for computation of earnings per share
Anti-dilutive potential shares excluded from the computation of diluted weighted average shares outstanding (in shares)	5,000	5,000	5,000

SEGMENT REPORTING (Details)

SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)segment	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Segment reporting
Number of reportable segments | segment			3
Revenue
Revenue	$ 111,739	$ 115,616	$ 331,743	$ 326,637
Depreciation and amortization	21,580	22,603	66,089	64,870
Non-cash stock-based compensation	1,887	1,548	4,608	4,881
Operating income (loss)	9,557	10,248	23,879	15,117
Segment Assets
Cash, Cash equivalents, and Investments	135,556		135,556		$ 161,703
Total current assets	225,584		225,584		228,723
Fixed assets, net	589,428		589,428		605,581
Goodwill	60,691		60,691		60,691
Total assets	1,113,414		1,113,414		1,130,726
Total current liabilities	132,862		132,862		119,669
Total debt	83,723		83,723		86,426
Capital Expenditures
Capital expenditures			50,662	49,486
Communication services
Revenue
Revenue	108,721	112,840	322,865	318,473
Mobility
Revenue
Revenue	23,838	23,965	67,807	70,861
Fixed
Revenue
Revenue	62,783	60,149	187,601	176,810
Carrier services
Revenue
Revenue	21,703	28,391	66,171	69,790
Other
Revenue
Revenue	397	335	1,286	1,012
Other
Revenue
Revenue	3,018	2,776	8,878	8,164
Renewable Energy
Revenue
Revenue	1,177	1,438	3,373	4,376
Managed Services
Revenue
Revenue	1,447	1,338	5,111	3,788
Construction
Revenue
Revenue	394		394
Corporate and Other
Revenue
Depreciation and amortization	1,689	1,728	5,048	4,973
Non-cash stock-based compensation	1,792	1,263	4,391	4,575
Operating income (loss)	(8,587)	(7,817)	(25,306)	(25,862)
Segment Assets
Cash, Cash equivalents, and Investments	20,302		20,302		55,284
Total current assets	15,978		15,978		55,485
Fixed assets, net	14,335		14,335		21,453
Total assets	144,062		144,062		184,419
Total current liabilities	23,801		23,801		14,375
Capital Expenditures
Capital expenditures			2,853	5,611
International Telecom | Operating segments
Revenue
Revenue	82,465	81,285	244,813	241,461
Depreciation and amortization	13,671	14,089	42,120	40,709
Non-cash stock-based compensation	29	285	20	306
Operating income (loss)	16,024	10,867	44,119	35,802
Segment Assets
Cash, Cash equivalents, and Investments	67,701		67,701		43,125
Total current assets	124,515		124,515		91,497
Fixed assets, net	452,303		452,303		466,523
Goodwill	25,421		25,421		25,421
Total assets	664,307		664,307		647,228
Total current liabilities	71,254		71,254		77,644
Total debt	83,723		83,723		86,426
Capital Expenditures
Capital expenditures			28,439	8,533
International Telecom | Operating segments | Communication services
Revenue
Revenue	81,018	79,947	239,702	237,673
International Telecom | Operating segments | Mobility
Revenue
Revenue	21,406	21,364	60,604	62,766
International Telecom | Operating segments | Fixed
Revenue
Revenue	57,364	55,845	172,420	166,925
International Telecom | Operating segments | Carrier services
Revenue
Revenue	1,851	2,403	5,392	6,970
International Telecom | Operating segments | Other
Revenue
Revenue	397	335	1,286	1,012
International Telecom | Operating segments | Other
Revenue
Revenue	1,447	1,338	5,111	3,788
International Telecom | Operating segments | Managed Services
Revenue
Revenue	1,447	1,338	5,111	3,788
US Telecom | Operating segments
Revenue
Revenue	28,097	32,893	83,557	80,800
Depreciation and amortization	5,729	5,770	17,331	16,919
Operating income (loss)	2,218	7,912	6,241	5,927
Segment Assets
Cash, Cash equivalents, and Investments	25,177		25,177		38,240
Total current assets	59,801		59,801		54,207
Fixed assets, net	77,017		77,017		69,184
Goodwill	35,270		35,270		35,270
Total assets	233,288		233,288		222,356
Total current liabilities	36,898		36,898		24,905
Capital Expenditures
Capital expenditures			17,254	33,159
US Telecom | Operating segments | Communication services
Revenue
Revenue	27,703	32,893	83,163	80,800
US Telecom | Operating segments | Mobility
Revenue
Revenue	2,432	2,601	7,203	8,095
US Telecom | Operating segments | Fixed
Revenue
Revenue	5,419	4,304	15,181	9,885
US Telecom | Operating segments | Carrier services
Revenue
Revenue	19,852	25,988	60,779	62,820
US Telecom | Operating segments | Other
Revenue
Revenue	394		394
US Telecom | Operating segments | Construction
Revenue
Revenue	394		394
Renewable Energy | Operating segments
Revenue
Revenue	1,177	1,438	3,373	4,376
Depreciation and amortization	491	1,016	1,590	2,269
Non-cash stock-based compensation	66		197
Operating income (loss)	(98)	(714)	(1,175)	(750)
Segment Assets
Cash, Cash equivalents, and Investments	22,376		22,376		25,054
Total current assets	25,290		25,290		27,534
Fixed assets, net	45,773		45,773		48,421
Total assets	71,757		71,757		76,723
Total current liabilities	909		909		$ 2,745
Capital Expenditures
Capital expenditures			2,116	2,183
Renewable Energy | Operating segments | Other
Revenue
Revenue	1,177	1,438	3,373	4,376
Renewable Energy | Operating segments | Renewable Energy
Revenue
Revenue	$ 1,177	$ 1,438	$ 3,373	$ 4,376

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Oct. 05, 2020item	Sep. 30, 2020USD ($)	Dec. 31, 2011USD ($)
Contingency related to spectrum fees
Commitments and contingencies
Spectrum fees paid			$ 2.6
Litigation proceedings and disputes in Guyana
Commitments and contingencies
Number of competitors issued service licenses | item	2
Legal claims regarding tax filings with the Guyana Revenue Authority
Commitments and contingencies
Future payments related to disputed tax assessments		$ 44.1
Accrued contingent liability		$ 5
Legal claims regarding tax filings with the Guyana Revenue Authority | Minimum
Commitments and contingencies
Percentage of return on investment ensured by the government of Guyana		15.00%

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details)	Oct. 31, 2020
Subsequent event | One Communications
SUBSEQUENT EVENT
Ownership percentage	70.00%