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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment reporting |  |  |  |  |
Number of reportable segments | segment | 5 |  | 5 |  |
Revenue |  |  |  |  |
Revenue | $ 138,795 | $ 96,782 | $ 328,471 | $ 272,453 |
Depreciation and amortization | 21,866 | 14,590 | 52,913 | 43,813 |
Non-cash stock-based compensation | 1,399 | 1,156 | 5,032 | 3,832 |
Operating income (loss) | 22,081 | 22,524 | 39,886 | 70,411 |
Segment Assets |  |  |  |  |
Net fixed assets | 618,535 |  | 618,535 |  | $ 373,503
Goodwill | 62,042 |  | 62,042 |  | 45,077
Total assets | 1,166,057 |  | 1,166,057 |  | 945,004
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 78,455 | 46,031 |
U.S. Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 61,151 | 67,521 | 177,300 | 185,272 |
Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 66,129 | 21,760 | 122,190 | 63,520 |
Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,731 | 2,449 | 12,046 | 8,030 |
Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,784 | 5,052 | 16,935 | 15,631 |
Reconciling Items |  |  |  |  |
Revenue |  |  |  |  |
Depreciation and amortization | 1,567 | 1,270 | 4,384 | 3,616 |
Non-cash stock-based compensation | 1,371 | 1,127 | 4,946 | 3,594 |
Operating income (loss) | (10,219) | (9,316) | (27,398) | (23,187) |
Segment Assets |  |  |  |  |
Net fixed assets | 10,229 |  | 10,229 |  | 14,085
Total assets | 144,925 |  | 144,925 |  | 315,739
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 4,877 | 2,576 |
U.S. Telecom |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 47,560 | 53,825 | 137,703 | 143,682 |
Depreciation and amortization | 6,176 | 5,715 | 17,405 | 16,874 |
Operating income (loss) | 18,120 | 24,218 | 39,698 | 64,114 |
Segment Assets |  |  |  |  |
Net fixed assets | 134,219 |  | 134,219 |  | 119,596
Goodwill | 32,739 |  | 32,739 |  | 39,639
Total assets | 252,827 |  | 252,827 |  | 227,707
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 26,709 | 27,632 |
U.S. Telecom | U.S. Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 40,076 | 47,047 | 117,194 | 122,993 |
U.S. Telecom | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 6,936 | 6,243 | 18,793 | 18,915 |
U.S. Telecom | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 548 | 535 | 1,716 | 1,774 |
International Telecom |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 85,313 | 37,905 | 173,574 | 113,140 |
Depreciation and amortization | 12,896 | 6,400 | 27,482 | 19,710 |
Operating income (loss) | 11,358 | 4,928 | 28,320 | 21,447 |
Segment Assets |  |  |  |  |
Net fixed assets | 357,733 |  | 357,733 |  | 133,262
Goodwill | 26,024 |  | 26,024 |  | 5,438
Total assets | 588,190 |  | 588,190 |  | 278,770
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 36,543 | 15,797 |
International Telecom | U.S. Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 21,075 | 20,474 | 60,106 | 62,279 |
International Telecom | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 59,193 | 15,517 | 103,397 | 44,605 |
International Telecom | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,045 | 1,914 | 10,071 | 6,256 |
Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,922 | 5,052 | 17,194 | 15,631 |
Depreciation and amortization | 1,227 | 1,205 | 3,642 | 3,613 |
Non-cash stock-based compensation | 28 | 29 | 86 | 238 |
Operating income (loss) | 2,822 | 2,694 | (734) | 8,037 |
Segment Assets |  |  |  |  |
Net fixed assets | 116,354 |  | 116,354 |  | 106,560
Goodwill | 3,279 |  | 3,279 |  |
Total assets | 180,115 |  | 180,115 |  | $ 122,788
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 10,326 | 26 |
Renewable energy | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 138 |  | 259 |  |
Renewable energy | Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | $ 5,784 | $ 5,052 | $ 16,935 | $ 15,631 |

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