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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Segment reporting |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 3 |  |
Revenue |  |  |  |  |  |
Revenue | $ 107,721 | $ 117,788 |  | $ 211,020 | $ 222,263 |
Depreciation and amortization | 21,549 | 21,913 |  | 42,267 | 43,217 |
Non-cash stock-based compensation | 2,028 | 2,103 |  | 3,334 | 3,679 |
Operating income (loss) | 2,754 | 15,753 |  | 4,868 | 19,962 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 150,892 |  |  | 150,892 |  | $ 192,229
Total current assets | 250,229 |  |  | 250,229 |  | 275,765
Fixed assets, net | 613,703 |  |  | 613,703 |  | 626,852
Goodwill | 63,970 |  |  | 63,970 |  | 63,970
Total assets | 1,146,976 |  |  | 1,146,976 |  | 1,107,304
Total current liabilities | 130,301 |  |  | 130,301 |  | 140,650
Total debt | 89,166 |  |  | 89,166 |  | 90,982
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 35,396 | 107,248 |
Hurricane rebuild capital expenditures |  |  |  | 123 | 66,654 |
Hurricane insurance proceeds |  |  |  |  | 34,606 |
Wireless |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 46,996 | 50,496 |  | 88,608 | 101,043 |
Wireline |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 59,276 | 61,269 |  | 119,473 | 109,365 |
Renewable Energy |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 1,449 | 6,023 |  | 2,939 | 11,855 |
Corporate and Other |  |  |  |  |  |
Revenue |  |  |  |  |  |
Depreciation and amortization | 1,754 | 1,385 |  | 3,244 | 2,731 |
Non-cash stock-based compensation | 2,017 | 2,054 |  | 3,313 | 3,574 |
Operating income (loss) | (9,991) | (9,586) |  | (18,045) | (18,177) |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 67,042 |  |  | 67,042 |  | 78,043
Total current assets | 62,385 |  |  | 62,385 |  | 83,107
Fixed assets, net | 22,708 |  |  | 22,708 |  | 20,381
Total assets | 179,121 |  |  | 179,121 |  | 181,789
Total current liabilities | 20,701 |  |  | 20,701 |  | 38,827
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 4,519 | 3,074 |
US Telecom | Operating segments |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 26,413 | 30,284 |  | 47,906 | 58,783 |
Depreciation and amortization | 5,551 | 6,835 |  | 11,149 | 13,348 |
Operating income (loss) | 1,521 | 7,841 |  | (2,006) | 13,065 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 22,925 |  |  | 22,925 |  | 19,118
Total current assets | 52,278 |  |  | 52,278 |  | 36,801
Fixed assets, net | 72,501 |  |  | 72,501 |  | 78,102
Goodwill | 35,269 |  |  | 35,269 |  | 35,269
Total assets | 222,110 |  |  | 222,110 |  | 172,634
Total current liabilities | 34,464 |  |  | 34,464 |  | 15,783
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 6,368 | 7,266 |
US Telecom | Operating segments | Wireless |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 25,656 | 28,582 |  | 46,093 | 55,983 |
US Telecom | Operating segments | Wireline |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 757 | 1,702 |  | 1,813 | 2,800 |
International Telecom | Operating segments |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 79,859 | 81,481 |  | 160,175 | 151,625 |
Depreciation and amortization | 13,606 | 11,794 |  | 26,621 | 23,465 |
Non-cash stock-based compensation | 11 | 20 |  | 21 | 48 |
Operating income (loss) | 11,057 | 15,571 |  | 24,935 | 21,211 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 38,403 |  |  | 38,403 |  | 32,390
Total current assets | 95,437 |  |  | 95,437 |  | 75,304
Fixed assets, net | 474,185 |  |  | 474,185 |  | 482,770
Goodwill | 25,421 |  |  | 25,421 |  | 25,421
Total assets | 657,062 |  |  | 657,062 |  | 622,454
Total current liabilities | 73,671 |  |  | 73,671 |  | 82,575
Total debt | 89,166 |  |  | 89,166 |  | 90,970
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 23,692 | 95,520 |
Hurricane rebuild capital expenditures |  |  |  | 100 |  | 66,700
Hurricane insurance proceeds |  |  | $ 34,600 |  |  |
International Telecom | Operating segments | Wireless |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 21,340 | 21,914 |  | 42,515 | 45,060 |
International Telecom | Operating segments | Wireline |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 58,519 | 59,567 |  | 117,660 | 106,565 |
Renewable Energy | Operating segments |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | 1,449 | 6,023 |  | 2,939 | 11,855 |
Depreciation and amortization | 638 | 1,899 |  | 1,253 | 3,673 |
Non-cash stock-based compensation |  | 29 |  |  | 57 |
Operating income (loss) | 167 | 1,927 |  | (16) | 3,863 |
Segment Assets |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 22,522 |  |  | 22,522 |  | 62,678
Total current assets | 40,129 |  |  | 40,129 |  | 80,553
Fixed assets, net | 44,309 |  |  | 44,309 |  | 45,599
Goodwill | 3,280 |  |  | 3,280 |  | 3,280
Total assets | 88,683 |  |  | 88,683 |  | 130,427
Total current liabilities | 1,465 |  |  | 1,465 |  | 3,465
Total debt |  |  |  |  |  | $ 12
Capital Expenditures |  |  |  |  |  |
Capital expenditures |  |  |  | 817 | 1,388 |
Renewable Energy | Operating segments | Renewable Energy |  |  |  |  |  |
Revenue |  |  |  |  |  |
Revenue | $ 1,449 | $ 6,023 |  | $ 2,939 | $ 11,855 |

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