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SEGMENT REPORTING (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Revenue |  |  |  |  |
Revenue | $ 122,132 | $ 138,795 | $ 373,492 | $ 328,471 |
Depreciation and amortization | 21,157 | 21,866 | 65,904 | 52,913 |
Non-cash stock-based compensation | 1,658 | 1,399 | 5,437 | 5,032 |
Operating income (loss) | (19,525) | 22,081 | 14,118 | 39,886 |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 232,454 |  | 232,454 |  | $ 278,958
Total current assets | 334,738 |  | 334,738 |  | 367,369
Fixed assets, net | 624,595 |  | 624,595 |  | 647,712
Goodwill | 63,969 |  | 63,969 |  | 62,873
Total assets | 1,184,018 |  | 1,184,018 |  | 1,198,218
Total current liabilities | 173,677 |  | 173,677 |  | 150,105
Total debt | 159,651 |  | 159,651 |  | 156,823
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 108,276 | 78,455 |
Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 57,254 | 61,151 | 167,945 | 177,300 |
Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 56,309 | 66,129 | 181,568 | 122,190 |
Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 4,974 | 5,784 | 14,765 | 16,935 |
Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 3,595 | 5,731 | 9,214 | 12,046 |
Corporate and Other |  |  |  |  |
Revenue |  |  |  |  |
Depreciation and amortization | 1,112 | 1,567 | 3,526 | 4,385 |
Non-cash stock-based compensation | 1,621 | 1,371 | 5,205 | 4,946 |
Operating income (loss) | (7,997) | (10,219) | (25,952) | (27,398) |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 70,643 |  | 70,643 |  | 131,664
Total current assets | 84,729 |  | 84,729 |  | 135,745
Fixed assets, net | 18,271 |  | 18,271 |  | 15,429
Total assets | 174,719 |  | 174,719 |  | 170,505
Total current liabilities | 15,692 |  | 15,692 |  | 18,838
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 4,778 | 4,877 |
U.S. Telecom | Operating segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 40,111 | 47,560 | 120,881 | 137,703 |
Depreciation and amortization | 6,301 | 6,211 | 19,098 | 17,510 |
Operating income (loss) | 15,987 | 18,120 | 44,520 | 39,698 |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 31,328 |  | 31,328 |  | 22,235
Total current assets | 61,473 |  | 61,473 |  | 50,983
Fixed assets, net | 100,349 |  | 100,349 |  | 129,274
Goodwill | 35,268 |  | 35,268 |  | 35,268
Total assets | 221,528 |  | 221,528 |  | 240,006
Total current liabilities | 53,065 |  | 53,065 |  | 23,162
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 17,396 | 26,709 |
U.S. Telecom | Operating segments | Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 36,830 | 40,076 | 108,499 | 117,194 |
U.S. Telecom | Operating segments | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 2,336 | 6,936 | 10,443 | 18,793 |
U.S. Telecom | Operating segments | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 945 | 548 | 1,939 | 1,716 |
International Telecom segment | Operating segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 77,011 | 85,313 | 237,672 | 173,574 |
Depreciation and amortization | 12,088 | 12,861 | 38,339 | 27,376 |
Non-cash stock-based compensation | 8 |  | 146 |  |
Operating income (loss) | (28,491) | 11,358 | (7,713) | 28,320 |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 111,336 |  | 111,336 |  | 97,681
Total current assets | 163,235 |  | 163,235 |  | 143,201
Fixed assets, net | 347,421 |  | 347,421 |  | 372,741
Goodwill | 25,421 |  | 25,421 |  | 24,326
Total assets | 586,747 |  | 586,747 |  | 597,454
Total current liabilities | 86,359 |  | 86,359 |  | 95,502
Total debt | 95,464 |  | 95,464 |  | 91,316
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 54,775 | 36,543 |
International Telecom segment | Operating segments | Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 20,424 | 21,075 | 59,446 | 60,106 |
International Telecom segment | Operating segments | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 53,973 | 59,193 | 171,125 | 103,397 |
International Telecom segment | Operating segments | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 2,614 | 5,045 | 7,101 | 10,071 |
Renewable energy | Operating segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,010 | 5,922 | 14,939 | 17,194 |
Depreciation and amortization | 1,656 | 1,227 | 4,941 | 3,642 |
Non-cash stock-based compensation | 29 | 28 | 86 | 86 |
Operating income (loss) | 976 | 2,822 | 3,263 | (734) |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 19,147 |  | 19,147 |  | 27,378
Total current assets | 25,301 |  | 25,301 |  | 37,440
Fixed assets, net | 158,554 |  | 158,554 |  | 130,268
Goodwill | 3,280 |  | 3,280 |  | 3,279
Total assets | 201,024 |  | 201,024 |  | 190,253
Total current liabilities | 18,561 |  | 18,561 |  | 12,603
Total debt | 64,187 |  | 64,187 |  | $ 65,507
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 31,327 | 10,326 |
Renewable energy | Operating segments | Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 4,974 | 5,784 | 14,765 | 16,935 |
Renewable energy | Operating segments | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | $ 36 | $ 138 | $ 174 | $ 259 |

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