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Note 19 - Business Segments (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 ) |  |  | 2,470,949 |  |  |  | 115,713 |  |  |  |  |  | 2,586,662 |
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 income 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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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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