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Note 19 - Business Segments (Restated) - 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
Revenues | $ 166,365 | $ 157,185 | $ 179,364 | $ 189,898 | $ 166,519 | $ 184,617 | $ 159,861 | $ 151,594 | $ 692,812 | [1] | $ 662,591 | [1] | $ 594,644 | [1]
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 (losses) 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 109,040 |  | 56,075 |  | 48,559 |
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ (109,040) |  | $ (56,075) |  | $ (48,559) |
[1] | Revenues as reported in the geographic area in which they originate.

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