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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Segment reporting |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 3 |  |
Revenue |  |  |  |  |  |
Revenue | $ 115,616 | $ 121,138 |  | $ 326,637 | $ 343,401 |
Depreciation and amortization | 22,603 | 21,384 |  | 64,870 | 64,602 |
Non-cash stock-based compensation | 1,548 | 1,393 |  | 4,881 | 5,071 |
Operating income (loss) | 10,248 | 30,824 |  | 15,117 | 50,786 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 168,530 |  |  | 168,530 |  | $ 192,229
Total current assets | 257,811 |  |  | 257,811 |  | 275,765
Fixed assets, net | 605,501 |  |  | 605,501 |  | 626,852
Goodwill | 63,970 |  |  | 63,970 |  | 63,970
Total assets | 1,162,800 |  |  | 1,162,800 |  | 1,107,304
Total current liabilities | 141,030 |  |  | 141,030 |  | 140,650
Total debt | 88,265 |  |  | 88,265 |  | 90,982
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 49,486 | 154,278 |
Hurricane rebuild capital expenditures |  |  |  | 123 | 78,903 |
Hurricane insurance proceeds |  |  |  |  | 34,606 |
Wireless |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 54,555 | 52,003 |  | 143,705 | 153,046 |
Wireline |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 59,623 | 63,717 |  | 178,555 | 173,083 |
Renewable Energy |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 1,438 | 5,418 |  | 4,377 | 17,272 |
Corporate and Other |  |  |  |  |  |
Revenue |  |  |  |  |  |
Depreciation and amortization | 1,728 | 1,459 |  | 4,973 | 4,190 |
Non-cash stock-based compensation | 1,263 | 1,344 |  | 4,575 | 4,917 |
Operating income (loss) | (7,817) | (8,011) |  | (25,862) | (26,189) |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 59,584 |  |  | 59,584 |  | 78,043
Total current assets | 57,220 |  |  | 57,220 |  | 83,107
Fixed assets, net | 22,024 |  |  | 22,024 |  | 20,381
Total assets | 185,624 |  |  | 185,624 |  | 181,789
Total current liabilities | 33,458 |  |  | 33,458 |  | 38,827
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 5,611 | 6,385 |
US Telecom | Operating segments |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 32,893 | 31,808 |  | 80,799 | 90,591 |
Depreciation and amortization | 5,770 | 5,665 |  | 16,919 | 19,013 |
Operating income (loss) | 7,912 | 22,773 |  | 5,927 | 35,839 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 36,738 |  |  | 36,738 |  | 19,118
Total current assets | 60,782 |  |  | 60,782 |  | 36,801
Fixed assets, net | 69,642 |  |  | 69,642 |  | 78,102
Goodwill | 35,269 |  |  | 35,269 |  | 35,269
Total assets | 230,585 |  |  | 230,585 |  | 172,634
Total current liabilities | 30,870 |  |  | 30,870 |  | 15,783
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 8,533 | 9,461 |
US Telecom | Operating segments | Wireless |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 32,168 | 29,784 |  | 78,261 | 85,767 |
US Telecom | Operating segments | Wireline |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 725 | 2,024 |  | 2,538 | 4,824 |
International Telecom | Operating segments |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 81,285 | 83,912 |  | 241,461 | 235,538 |
Depreciation and amortization | 14,089 | 12,441 |  | 40,709 | 35,907 |
Non-cash stock-based compensation | 285 | 20 |  | 306 | 68 |
Operating income (loss) | 10,867 | 16,239 |  | 35,802 | 37,449 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 51,178 |  |  | 51,178 |  | 32,390
Total current assets | 101,113 |  |  | 101,113 |  | 75,304
Fixed assets, net | 470,338 |  |  | 470,338 |  | 482,770
Goodwill | 25,421 |  |  | 25,421 |  | 25,421
Total assets | 660,367 |  |  | 660,367 |  | 622,454
Total current liabilities | 75,348 |  |  | 75,348 |  | 82,575
Total debt | 88,265 |  |  | 88,265 |  | 90,970
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 33,159 | 136,790 |
Hurricane rebuild capital expenditures |  |  |  | 100 |  | 78,900
Hurricane insurance proceeds |  |  | $ 34,600 |  |  |
International Telecom | Operating segments | Wireless |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 22,387 | 22,219 |  | 65,444 | 67,279 |
International Telecom | Operating segments | Wireline |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 58,898 | 61,693 |  | 176,017 | 168,259 |
Renewable Energy | Operating segments |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 1,438 | 5,418 |  | 4,377 | 17,272 |
Depreciation and amortization | 1,016 | 1,819 |  | 2,269 | 5,492 |
Non-cash stock-based compensation |  | 29 |  |  | 86 |
Operating income (loss) | (714) | (177) |  | (750) | 3,687 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 21,030 |  |  | 21,030 |  | 62,678
Total current assets | 38,696 |  |  | 38,696 |  | 80,553
Fixed assets, net | 43,497 |  |  | 43,497 |  | 45,599
Goodwill | 3,280 |  |  | 3,280 |  | 3,280
Total assets | 86,224 |  |  | 86,224 |  | 130,427
Total current liabilities | 1,354 |  |  | 1,354 |  | 3,465
Total debt |  |  |  |  |  | $ 12
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 2,183 | 1,642 |
Renewable Energy | Operating segments | Renewable Energy |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | $ 1,438 | $ 5,418 |  | $ 4,377 | $ 17,272 |

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