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Note 19 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total segment revenues | [1] |  |  |  |  |  |  |  |  | $ 692,812 | $ 662,591 | $ 594,644
Operating income |  | $ 48,400 | $ 43,970 | $ 53,152 | $ 59,496 | $ 51,229 | $ 48,223 | $ 51,887 | $ 50,543 | 205,018 | 201,882 | 164,061
Interest income |  | 127 | 255 | 362 | 244 | 140 | 266 | 245 | 320 | 988 | 971 | 297
Interest expense, net |  | (12,987) | (11,692) | (14,540) | (14,923) | (15,828) | (17,137) | (18,401) | (16,023) | (54,142) | (67,389) | (72,577)
Derivatives and foreign currency transaction gains (losses) |  | 614 | (1,001) | 1,703 | 1,338 | (2,942) | (222) | (4,332) | 1,962 | 2,654 | (5,534) | (1,622)
Income attributable to sale of tax benefits |  | 3,859 | 3,506 | 4,356 | 6,157 | 4,123 | 3,463 | 4,519 | 4,398 | 17,878 | 16,503 | 25,431
Other non-operating income (expense), net |  | 12 | (1,592) | 6 | (92) | (39) | (5,546) | 49 | 191 | (1,666) | (5,345) | (1,991)
Income (loss) from continuing operations, before income taxes and equity in income of investees |  | $ 40,025 | $ 33,446 | $ 45,039 | $ 52,220 | $ 36,683 | $ 29,047 | $ 33,967 | $ 41,391 | 170,730 | 141,088 | 113,599
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total segment revenues |  |  |  |  |  |  |  |  |  | 109,040 | 56,075 | 48,559
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total segment revenues |  |  |  |  |  |  |  |  |  | $ (109,040) | $ (56,075) | $ (48,559)
[1] | Revenues as reported in the geographic area in which they originate.

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