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Note 8 - Property, Plant and Equipment and Construction-in-process - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Property, plant and equipment | $ 2,717,797 | $ 2,436,858
Asset retirement cost | 10,563 | 8,669
Less accumulated depreciation | (983,106) | (880,480)
Property, plant and equipment, net | 1,734,691 | 1,556,378
Land [Member] |  |
Property, plant and equipment | 32,178 | 31,904
Leasehold Improvements [Member] |  |
Property, plant and equipment | 3,984 | 3,848
Machinery and Equipment [Member] |  |
Property, plant and equipment | 182,121 | 152,821
Office Equipment [Member] |  |
Property, plant and equipment | 31,128 | 28,634
Automobiles [Member] |  |
Property, plant and equipment | 12,596 | 11,161
Geothermal And Recovered Energy Generation Power Plants [Member] | UNITED STATES |  |
Property, plant and equipment | 1,744,728 | 1,658,195
Geothermal And Recovered Energy Generation Power Plants [Member] | Foreign Countries [Member] |  |
Property, plant and equipment | $ 700,498 | $ 541,626

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