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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 112,085 | $ 115,616 | $ 107,721 | $ 103,300 | $ 107,806 | $ 121,138 | $ 117,788 | $ 104,475 | $ 438,722 | $ 451,207 | $ 481,193
Depreciation and amortization |  |  |  |  |  |  |  |  | 89,125 | 85,719 | 86,934
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 6,384 | 6,420 | 6,977
Operating income (loss) | (1,739) | $ 10,248 | $ 2,754 | $ 2,114 | 10,318 | $ 30,743 | $ 15,753 | 4,209 | 13,377 | 61,023 | 55,308
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 161,703 |  |  |  | 192,229 |  |  |  | 161,703 | 192,229 |
Total current assets | 228,723 |  |  |  | 275,765 |  |  |  | 228,723 | 275,765 |
Fixed assets, net | 605,581 |  |  |  | 626,852 |  |  |  | 605,581 | 626,852 |
Goodwill | 60,691 |  |  |  | 63,970 |  |  |  | 60,691 | 63,970 | 63,970
Total assets | 1,130,726 |  |  |  | 1,107,304 |  |  |  | 1,130,726 | 1,107,304 |
Total current liabilities | 119,669 |  |  |  | 140,650 |  |  |  | 119,669 | 140,650 |
Total debt | 86,426 |  |  |  | 90,982 |  |  |  | 86,426 | 90,982 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 72,725 | 185,921 |
Hurricane rebuild capital expenditures |  |  |  |  |  |  |  |  | 123 | 80,152 | 8,585
Hurricane insurance proceeds |  |  |  |  |  |  |  |  |  | 34,606 |
Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 193,488 | 198,824 | 232,501
Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 239,700 | 230,225 | 227,827
Renewable Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,534 | 22,158 | 20,865
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,708 | 5,626 | 4,658
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 5,892 | 6,227 | 6,675
Operating income (loss) |  |  |  |  |  |  |  |  | (34,365) | (34,252) | (33,496)
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 55,284 |  |  |  | 78,043 |  |  |  | 55,284 | 78,043 |
Total current assets | 55,485 |  |  |  | 83,107 |  |  |  | 55,485 | 83,107 |
Fixed assets, net | 21,453 |  |  |  | 20,381 |  |  |  | 21,453 | 20,381 |
Total assets | 184,419 |  |  |  | 181,789 |  |  |  | 184,419 | 181,789 |
Total current liabilities | 14,375 |  |  |  | 38,827 |  |  |  | 14,375 | 38,827 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 6,758 | 8,004 |
International Telecom |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 24,326 |  |  |  | 24,326 |  |  |  | 24,326 | 24,326 | 24,326
International Telecom | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 324,540 | 313,569 | 304,605
Depreciation and amortization |  |  |  |  |  |  |  |  | 55,993 | 48,889 | 50,007
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 405 | 88 | 188
Operating income (loss) |  |  |  |  |  |  |  |  | 46,921 | 45,022 | 28,308
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 43,125 |  |  |  | 32,390 |  |  |  | 43,125 | 32,390 |
Total current assets | 91,497 |  |  |  | 75,304 |  |  |  | 91,497 | 75,304 |
Fixed assets, net | 466,523 |  |  |  | 482,770 |  |  |  | 466,523 | 482,770 |
Goodwill | 25,421 |  |  |  | 25,421 |  |  |  | 25,421 | 25,421 |
Total assets | 647,228 |  |  |  | 622,454 |  |  |  | 647,228 | 622,454 |
Total current liabilities | 77,644 |  |  |  | 82,575 |  |  |  | 77,644 | 82,575 |
Total debt | 86,426 |  |  |  | 90,970 |  |  |  | 86,426 | 90,970 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 42,029 | 160,013 |
Hurricane rebuild capital expenditures |  |  |  |  |  |  |  |  |  | 82,100 |
Hurricane insurance proceeds |  |  |  |  |  |  |  | $ 34,600 |  |  |
International Telecom | Operating segments | Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 88,054 | 89,946 | 89,473
International Telecom | Operating segments | Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 236,486 | 223,623 | 215,132
US Telecom |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 35,268 |  |  |  | 35,268 |  |  |  | 35,268 | 35,268 | 35,268
US Telecom | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 108,648 | 115,480 | 155,723
Depreciation and amortization |  |  |  |  |  |  |  |  | 23,119 | 24,615 | 25,601
Operating income (loss) |  |  |  |  |  |  |  |  | 8,064 | 36,813 | 55,317
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 38,240 |  |  |  | 19,118 |  |  |  | 38,240 | 19,118 |
Total current assets | 54,207 |  |  |  | 36,801 |  |  |  | 54,207 | 36,801 |
Fixed assets, net | 69,184 |  |  |  | 78,102 |  |  |  | 69,184 | 78,102 |
Goodwill | 35,270 |  |  |  | 35,269 |  |  |  | 35,270 | 35,269 |
Total assets | 222,356 |  |  |  | 172,634 |  |  |  | 222,356 | 172,634 |
Total current liabilities | 24,905 |  |  |  | 15,783 |  |  |  | 24,905 | 15,783 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 17,490 | 13,389 |
US Telecom | Operating segments | Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 105,434 | 108,878 | 143,028
US Telecom | Operating segments | Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,214 | 6,602 | 12,695
Renewable Energy |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 0 |  |  |  | 3,279 |  |  |  | 0 | 3,279 | 3,279
Renewable Energy | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,534 | 22,158 | 20,865
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,305 | 6,589 | 6,668
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 87 | 105 | 114
Operating income (loss) |  |  |  |  |  |  |  |  | (7,243) | 13,440 | 5,179
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 25,054 |  |  |  | 62,678 |  |  |  | 25,054 | 62,678 |
Total current assets | 27,534 |  |  |  | 80,553 |  |  |  | 27,534 | 80,553 |
Fixed assets, net | 48,421 |  |  |  | 45,599 |  |  |  | 48,421 | 45,599 |
Goodwill |  |  |  |  | 3,280 |  |  |  |  | 3,280 |
Total assets | 76,723 |  |  |  | 130,427 |  |  |  | 76,723 | 130,427 |
Total current liabilities | $ 2,745 |  |  |  | 3,465 |  |  |  | 2,745 | 3,465 |
Total debt |  |  |  |  | $ 12 |  |  |  |  | 12 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 6,448 | 4,515 |
Renewable Energy | Operating segments | Renewable Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 5,534 | $ 22,158 | $ 20,865

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