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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 107,701 | $ 122,132 | $ 123,245 | $ 128,115 | $ 128,531 | $ 138,795 | $ 99,991 | $ 89,686 | $ 481,193 | $ 457,003 | $ 355,369
Depreciation and amortization |  |  |  |  |  |  |  |  | 86,934 | 75,980 | 56,890
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 6,977 | 6,410 | 4,975
Operating income (loss) | 41,357 | $ (19,525) | $ 15,843 | $ 17,793 | 9,911 | $ 22,081 | $ 1,912 | $ 15,893 | 55,468 | 49,797 | 78,595
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 215,032 |  |  |  | 278,958 |  |  |  | 215,032 | 278,958 |
Total current assets | 342,928 |  |  |  | 367,369 |  |  |  | 342,928 | 367,369 |
Fixed assets, net | 643,146 |  |  |  | 647,712 |  |  |  | 643,146 | 647,712 |
Goodwill | 63,970 |  |  |  | 62,873 |  |  |  | 63,970 | 62,873 | 45,077
Total assets | 1,205,605 |  |  |  | 1,198,218 |  |  |  | 1,205,605 | 1,198,218 |
Total current liabilities | 161,705 |  |  |  | 150,105 |  |  |  | 161,705 | 150,105 |
Total debt | 155,792 |  |  |  | 156,823 |  |  |  | 155,792 | 156,823 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 142,371 | 124,282 | 64,753
Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 222,040 | 228,798 | 237,042
Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 225,763 | 188,019 | 86,485
Renewable Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,467 | 21,608 | 21,040
Equipment and other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,923 | 18,578 | 10,802
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,659 | 6,030 | 4,948
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 6,675 | 6,274 | 4,708
Operating income (loss) |  |  |  |  |  |  |  |  | (33,496) | (34,471) | (30,784)
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 76,627 |  |  |  | 131,664 |  |  |  | 76,627 | 131,664 |
Total current assets | 93,497 |  |  |  | 135,745 |  |  |  | 93,497 | 135,745 |
Fixed assets, net | 17,752 |  |  |  | 15,429 |  |  |  | 17,752 | 15,429 |
Total assets | 184,050 |  |  |  | 170,505 |  |  |  | 184,050 | 170,505 |
Total current liabilities | 13,816 |  |  |  | 18,838 |  |  |  | 13,816 | 18,838 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 6,491 | 6,876 |
U.S. Telecom |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 35,268 |  |  |  | 35,268 |  |  |  | 35,268 | 35,268 | 39,639
U.S. Telecom | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 155,724 | 176,726 | 182,986
Depreciation and amortization |  |  |  |  |  |  |  |  | 25,601 | 24,471 | 22,239
Operating income (loss) |  |  |  |  |  |  |  |  | 55,317 | 49,078 | 74,459
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 19,585 |  |  |  | 22,235 |  |  |  | 19,585 | 22,235 |
Total current assets | 40,975 |  |  |  | 50,983 |  |  |  | 40,975 | 50,983 |
Fixed assets, net | 99,462 |  |  |  | 129,274 |  |  |  | 99,462 | 129,274 |
Goodwill | 35,269 |  |  |  | 35,268 |  |  |  | 35,269 | 35,268 |
Total assets | 200,142 |  |  |  | 240,006 |  |  |  | 200,142 | 240,006 |
Total current liabilities | 41,248 |  |  |  | 23,162 |  |  |  | 41,248 | 23,162 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 22,230 | 31,983 |
U.S. Telecom | Operating segments | Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 140,636 | 148,053 | 155,390
U.S. Telecom | Operating segments | Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,656 | 26,448 | 25,241
U.S. Telecom | Operating segments | Equipment and other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,432 | 2,225 | 2,355
International Telecom segment | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 304,603 | 258,276 | 151,343
Depreciation and amortization |  |  |  |  |  |  |  |  | 50,007 | 40,492 | 24,883
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 188 | 22 |
Operating income (loss) |  |  |  |  |  |  |  |  | 28,468 | 35,436 | 28,200
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 110,700 |  |  |  | 97,681 |  |  |  | 110,700 | 97,681 |
Total current assets | 190,396 |  |  |  | 143,201 |  |  |  | 190,396 | 143,201 |
Fixed assets, net | 367,485 |  |  |  | 372,741 |  |  |  | 367,485 | 372,741 |
Goodwill | 25,421 |  |  |  | 24,326 |  |  |  | 25,421 | 24,326 |
Total assets | 629,007 |  |  |  | 597,454 |  |  |  | 629,007 | 597,454 |
Total current liabilities | 91,887 |  |  |  | 95,502 |  |  |  | 91,887 | 95,502 |
Total debt | 94,577 |  |  |  | 91,316 |  |  |  | 94,577 | 91,316 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 80,912 | 62,808 |
International Telecom segment | Operating segments | Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 81,404 | 80,745 | 81,652
International Telecom segment | Operating segments | Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 213,107 | 161,571 | 61,244
International Telecom segment | Operating segments | Equipment and other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 10,092 | 15,960 | 8,447
Renewable Energy |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 3,279 |  |  |  | 3,279 |  |  |  | 3,279 | 3,279 |
Renewable Energy | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,866 | 22,001 | 21,040
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,667 | 4,987 | 4,820
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 114 | 114 | 267
Operating income (loss) |  |  |  |  |  |  |  |  | 5,179 | (246) | 6,720
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Cash, Cash equivalents, and Investments | 8,120 |  |  |  | 27,378 |  |  |  | 8,120 | 27,378 |
Total current assets | 18,060 |  |  |  | 37,440 |  |  |  | 18,060 | 37,440 |
Fixed assets, net | 158,447 |  |  |  | 130,268 |  |  |  | 158,447 | 130,268 |
Goodwill | 3,280 |  |  |  | 3,279 |  |  |  | 3,280 | 3,279 |
Total assets | 192,406 |  |  |  | 190,253 |  |  |  | 192,406 | 190,253 |
Total current liabilities | 14,754 |  |  |  | 12,603 |  |  |  | 14,754 | 12,603 |
Total debt | $ 61,215 |  |  |  | $ 65,507 |  |  |  | 61,215 | 65,507 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 32,738 | 22,615 |
Renewable Energy | Operating segments | Renewable Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,467 | 21,608 | $ 21,040
Renewable Energy | Operating segments | Equipment and other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 399 | $ 393 |

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