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SEGMENT REPORTING (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) segment | Dec. 31, 2015 USD ($)
Segment reporting |  |  |  |  |
Number of reportable segments | segment |  | 5 |  | 5 |
Revenue |  |  |  |  |
Revenue | $ 99,991 | $ 90,326 | $ 189,676 | $ 175,670 |
Depreciation and amortization | 16,493 | 14,472 | 31,047 | 29,223 |
Non-cash stock-based compensation | 1,905 | 1,453 | 3,633 | 2,677 |
Operating income (loss) | 1,912 | 28,732 | 17,804 | 47,892 |
Segment Assets |  |  |  |  |
Net fixed assets | 486,729 |  | 486,729 |  | $ 373,503
Goodwill | 40,865 |  | 40,865 |  | 45,077
Total assets | 1,045,384 |  | 1,045,384 |  | 945,004
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 42,727 | 28,031 |
U.S. Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 57,088 | 60,326 | 115,965 | 117,341 |
Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 33,976 | 22,089 | 56,421 | 42,681 |
Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 3,365 | 2,621 | 6,139 | 5,069 |
Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,562 | 5,290 | 11,151 | 10,579 |
Reconciling Items |  |  |  |  |
Revenue |  |  |  |  |
Depreciation and amortization | 1,467 | 1,212 | 2,818 | 2,346 |
Non-cash stock-based compensation | 1,877 | 1,424 | 3,576 | 2,467 |
Operating income (loss) | (1,221) | (7,413) | (9,875) | (13,867) |
Segment Assets |  |  |  |  |
Net fixed assets | 10,544 |  | 10,544 |  | 14,085
Total assets | 268,738 |  | 268,738 |  | 315,739
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 3,755 | 1,679 |
U.S. Telecom |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 43,947 | 47,480 | 90,145 | 89,857 |
Depreciation and amortization | 5,609 | 5,657 | 11,229 | 11,159 |
Operating income (loss) | 4,797 | 23,122 | 21,579 | 39,896 |
Segment Assets |  |  |  |  |
Net fixed assets | 120,103 |  | 120,103 |  | 119,596
Goodwill | 32,148 |  | 32,148 |  | 39,639
Total assets | 242,524 |  | 242,524 |  | 227,707
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 16,447 | 17,075 |
U.S. Telecom | U.S. Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 37,655 | 40,103 | 77,119 | 75,946 |
U.S. Telecom | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,811 | 6,679 | 11,857 | 12,672 |
U.S. Telecom | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 481 | 698 | 1,169 | 1,239 |
International Telecom |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 50,362 | 37,556 | 88,260 | 75,234 |
Depreciation and amortization | 8,209 | 6,399 | 14,586 | 13,310 |
Operating income (loss) | 1,955 | 10,332 | 9,655 | 16,520 |
Segment Assets |  |  |  |  |
Net fixed assets | 243,935 |  | 243,935 |  | 133,262
Goodwill | 5,438 |  | 5,438 |  | 5,438
Total assets | 390,932 |  | 390,932 |  | 278,770
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 22,283 | 9,265 |
International Telecom | U.S. Wireless |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 19,433 | 20,223 | 38,846 | 41,395 |
International Telecom | Wireline |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 28,165 | 15,410 | 44,564 | 30,009 |
International Telecom | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 2,764 | 1,923 | 4,850 | 3,830 |
Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 5,682 | 5,290 | 11,271 | 10,579 |
Depreciation and amortization | 1,207 | 1,204 | 2,415 | 2,408 |
Non-cash stock-based compensation | 28 | 29 | 57 | 210 |
Operating income (loss) | (3,619) | 2,691 | (3,555) | 5,343 |
Segment Assets |  |  |  |  |
Net fixed assets | 112,147 |  | 112,147 |  | 106,560
Goodwill | 3,279 |  | 3,279 |  |
Total assets | 143,190 |  | 143,190 |  | $ 122,788
Capital Expenditures |  |  |  |  |
Capital expenditures |  |  | 242 | 12 |
Renewable energy | Equipment and other |  |  |  |  |
Revenue |  |  |  |  |
Revenue | 120 |  | 120 |  |
Renewable energy | Renewable energy |  |  |  |  |
Revenue |  |  |  |  |
Revenue | $ 5,562 | $ 5,290 | $ 11,151 | $ 10,579 |

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