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SEGMENT REPORTING (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Revenue |  |  |  |  |
Revenue | $ 123,245 | $ 99,991 | $ 251,360 | $ 189,676 |
Depreciation and amortization | 22,254 | 16,493 | 44,747 | 31,047 |
Non-cash stock-based compensation | 2,098 | 1,905 | 3,786 | 3,633 |
Operating income (loss) | 15,843 | 1,912 | 33,636 | 17,804 |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 239,395 |  | 239,395 |  | $ 278,958
Total current assets | 344,335 |  | 344,335 |  | 367,369
Fixed assets, net | 649,734 |  | 649,734 |  | 647,712
Goodwill | 62,873 |  | 62,873 |  | 62,873
Total assets | 1,201,476 |  | 1,201,476 |  | 1,198,218
Total current liabilities | 151,891 |  | 151,891 |  | 150,105
Total debt | 159,682 |  | 159,682 |  | 156,823
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 78,549 | 42,727 |
Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 54,460 | 57,088 | 110,690 | 115,965 |
Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 61,459 | 33,976 | 125,259 | 56,421 |
Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 4,891 | 5,562 | 9,791 | 11,151 |
Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 2,435 | 3,365 | 5,620 | 6,139 |
Corporate and Other |  |  |  |  |
Revenue |  |  |  |  |
Depreciation and amortization | 1,044 | 1,468 | 2,416 | 2,817 |
Non-cash stock-based compensation | 2,061 | 1,877 | 3,591 | 3,576 |
Operating income (loss) | (8,955) | (8,526) | (17,955) | (17,179) |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 107,679 |  | 107,679 |  | 131,664
Total current assets | 121,045 |  | 121,045 |  | 135,745
Fixed assets, net | 15,951 |  | 15,951 |  | 15,429
Total assets | 190,733 |  | 190,733 |  | 170,505
Total current liabilities | 15,128 |  | 15,128 |  | 18,838
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 3,294 | 3,755 |
U.S. Telecom | Operating segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 36,978 | 43,946 | 80,771 | 90,145 |
Depreciation and amortization | 6,246 | 5,609 | 12,797 | 11,229 |
Operating income (loss) | 13,147 | 4,797 | 28,533 | 21,579 |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 14,353 |  | 14,353 |  | 22,235
Total current assets | 43,730 |  | 43,730 |  | 50,983
Fixed assets, net | 102,532 |  | 102,532 |  | 129,274
Goodwill | 35,268 |  | 35,268 |  | 35,268
Total assets | 205,968 |  | 205,968 |  | 240,006
Total current liabilities | 44,733 |  | 44,733 |  | 23,162
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 12,602 | 16,447 |
U.S. Telecom | Operating segments | Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 34,505 | 37,655 | 71,668 | 77,119 |
U.S. Telecom | Operating segments | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 2,057 | 5,811 | 8,108 | 11,857 |
U.S. Telecom | Operating segments | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 416 | 480 | 995 | 1,169 |
International Telecom | Operating segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 81,370 | 50,363 | 160,660 | 88,260 |
Depreciation and amortization | 13,134 | 8,209 | 26,250 | 14,586 |
Non-cash stock-based compensation | 8 |  | 138 |  |
Operating income (loss) | 10,805 | 9,259 | 20,771 | 16,959 |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 98,684 |  | 98,684 |  | 97,681
Total current assets | 152,351 |  | 152,351 |  | 143,201
Fixed assets, net | 374,748 |  | 374,748 |  | 372,741
Goodwill | 24,326 |  | 24,326 |  | 24,326
Total assets | 602,990 |  | 602,990 |  | 597,454
Total current liabilities | 76,896 |  | 76,896 |  | 95,502
Total debt | 95,446 |  | 95,446 |  | 91,316
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 37,118 | 22,283 |
International Telecom | Operating segments | Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 19,955 | 19,433 | 39,022 | 38,846 |
International Telecom | Operating segments | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 59,402 | 28,165 | 117,151 | 44,564 |
International Telecom | Operating segments | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 2,013 | 2,765 | 4,487 | 4,850 |
Renewable energy | Operating segments |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 4,897 | 5,682 | 9,929 | 11,271 |
Depreciation and amortization | 1,830 | 1,207 | 3,284 | 2,415 |
Non-cash stock-based compensation | 29 | 28 | 57 | 57 |
Operating income (loss) | 846 | (3,618) | 2,287 | (3,555) |
Segment Assets |  |  |  |  |
Cash, Cash equivalents, and Investments | 18,679 |  | 18,679 |  | 27,378
Total current assets | 27,209 |  | 27,209 |  | 37,440
Fixed assets, net | 156,503 |  | 156,503 |  | 130,268
Goodwill | 3,279 |  | 3,279 |  | 3,279
Total assets | 201,785 |  | 201,785 |  | 190,253
Total current liabilities | 15,134 |  | 15,134 |  | 12,603
Total debt | 64,236 |  | 64,236 |  | $ 65,507
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 25,535 | 242 |
Renewable energy | Operating segments | Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 4,891 | 5,562 | 9,791 | 11,151 |
Renewable energy | Operating segments | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | $ 6 | $ 120 | $ 138 | $ 120 |

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