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Note 19 - Business Segments (Restated) (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Electricity |  |  | Product |  |  |  |  | Consolidated |
|  | (Dollars in thousands) |
Year Ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues from external customers |  | $ | 468,329 |  |  | $ | 224,483 |  |  |  |  | $ | 692,812 |
Intersegment revenues |  |  | — |  |  |  | 109,040 |  |  |  |  |  | 109,040 |
Depreciation and amortization expense |  |  | 111,676 |  |  |  | 3,470 |  |  |  |  |  | 115,146 |
Operating income |  |  | 154,475 |  |  |  | 50,543 |  |  |  |  |  | 205,018 |
Segment assets at period end (*) ( 1 ) (As restated) |  |  | 2,508,151 |  |  |  | 115,713 |  |  |  |  |  | 2,623,864 |
Expenditures for long-lived assets |  |  | 252,581 |  |  |  | 6,653 |  |  |  |  |  | 259,234 |
* Including unconsolidated investments |  |  | — |  |  |  | 34,084 |  |  |  |  |  | 34,084 |
Year Ended December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues from external customers |  | $ | 436,292 |  |  | $ | 226,299 |  |  |  |  | $ | 662,591 |
Intersegment revenues |  |  | — |  |  |  | 56,075 |  |  |  |  |  | 56,075 |
Depreciation and amortization expense |  |  | 102,698 |  |  |  | 3,279 |  |  |  |  |  | 105,977 |
Operating income |  |  | 126,828 |  |  |  | 75,054 |  |  |  |  |  | 201,882 |
Segment assets at period end ( 1 ) |  |  | 2,204,444 |  |  |  | 257,125 |  |  |  |  |  | 2,461,569 |
Expenditures for long-lived assets |  |  | 147,211 |  |  |  | 4,719 |  |  |  |  |  | 151,930 |
Year Ended December 31, 2015 : |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues from external customers |  | $ | 375,920 |  |  | $ | 218,724 |  |  |  |  | $ | 594,644 |
Intersegment revenues |  |  | — |  |  |  | 48,559 |  |  |  |  |  | 48,559 |
Depreciation and amortization expense |  |  | 103,892 |  |  |  | 3,314 |  |  |  |  |  | 107,206 |
Operating income |  |  | 99,345 |  |  |  | 64,716 |  |  |  |  |  | 164,061 |
Segment assets at period end |  |  | 2,044,346 |  |  |  | 229,636 |  |  |  |  |  | 2,273,982 |
Expenditures for long-lived assets |  |  | 149,666 |  |  |  | 2,784 |  |  |  |  |  | 152,450 |
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Total segment revenues |  | $ | 692,812 |  |  | $ | 662,591 |  |  | $ | 594,644 |
Intersegment revenues |  |  | 109,040 |  |  |  | 56,075 |  |  |  | 48,559 |
Elimination of intersegment revenues |  |  | (109,040 | ) |  |  | (56,075 | ) |  |  | (48,559 | )
Total consolidated revenues |  | $ | 692,812 |  |  | $ | 662,591 |  |  | $ | 594,644 |
Operating income: |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  | $ | 205,018 |  |  | $ | 201,882 |  |  | $ | 164,061 |
Interest income |  |  | 988 |  |  |  | 971 |  |  |  | 297 |
Interest expense, net |  |  | (54,142 | ) |  |  | (67,389 | ) |  |  | (72,577 | )
Foreign currency translation and transaction losses |  |  | 2,654 |  |  |  | (5,534 | ) |  |  | (1,622 | )
Income attributable to sale of equity interest |  |  | 17,878 |  |  |  | 16,503 |  |  |  | 25,431 |
Other non-operating income, net |  |  | (1,666 | ) |  |  | (5,345 | ) |  |  | (1,991 | )
Total consolidated income before income taxes and equity in losses of investees |  | $ | 170,730 |  |  | $ | 141,088 |  |  | $ | 113,599 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Revenues from external customers attributable to: (1) |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 301,132 |  |  | $ | 307,025 |  |  | $ | 286,509 |
Indonesia |  |  | 28,968 |  |  |  | 100,856 |  |  |  | 93,191 |
Kenya |  |  | 110,243 |  |  |  | 109,270 |  |  |  | 86,545 |
Turkey |  |  | 125,166 |  |  |  | 46,270 |  |  |  | 57,356 |
Chile |  |  | 8,895 |  |  |  | 58,032 |  |  |  | 34,478 |
Guatemala |  |  | 27,991 |  |  |  | 30,086 |  |  |  | 27,897 |
New Zealand |  |  | 33,395 |  |  |  | — |  |  |  | — |
Other foreign countries |  |  | 57,022 |  |  |  | 11,052 |  |  |  | 8,668 |
Consolidated total |  | $ | 692,812 |  |  | $ | 662,591 |  |  | $ | 594,644 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Long-lived assets (primarily power plants and related assets) located in: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 1,510,986 |  |  | $ | 1,414,523 |  |  | $ | 1,374,465 |
Kenya |  |  | 340,970 |  |  |  | 327,157 |  |  |  | 375,257 |
Other foreign countries |  |  | 281,333 |  |  |  | 199,559 |  |  |  | 107,407 |
Consolidated total |  | $ | 2,133,289 |  |  | $ | 1,941,239 |  |  | $ | 1,857,129 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Revenues |  |  | % |  |  | Revenues |  |  | % |  |  | Revenues |  |  | % |
|  | (Dollars in thousands) |  |  |  |  |  |  | (Dollars in thousands) |  |  |  |  |  |  | (Dollars in thousands) |  |  |  |  |
Southern California Edison (1) |  | $ | 29,714 |  |  |  | 4.3 |  |  | $ | 33,552 |  |  |  | 5.1 |  |  | $ | 56,026 |  |  |  | 9.4 |
Southern California Public Power Authority (1) |  |  | 70,100 |  |  |  | 10.1 |  |  |  | 67,566 |  |  |  | 10.2 |  |  |  | 30,947 |  |  |  | 5.2 |
Sierra Pacific Power Company and Nevada Power Company (1)(2) |  |  | 125,424 |  |  |  | 18.1 |  |  |  | 127,226 |  |  |  | 19.2 |  |  |  | 115,876 |  |  |  | 19.5 |
Hyundai ( 3 ) |  |  | 28,968 |  |  |  | 4.2 |  |  |  | 100,856 |  |  |  | 15.2 |  |  |  | 93,131 |  |  |  | 15.7 |
KPLC (1) |  |  | 110,243 |  |  |  | 15.9 |  |  |  | 109,270 |  |  |  | 16.5 |  |  |  | 86,545 |  |  |  | 14.6 |

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