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Note 7 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Beginning Balance |  |  |  |  | $ 554,319 |  |  |
Ending Balance | $ 698,635 |  |  |  | 698,635 |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Beginning Balance | (17,335) |  | $ (15,857) |  | (12,856) |  | $ (28,047) |
Other comprehensive income (loss) before reclassifications | 5,717 |  | 3,826 |  | 1,238 |  | 16,016 |
Amounts reclassified from AOCL |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 5,717 |  | 3,826 |  | 1,238 |  | 16,016 |
Ending Balance | (11,618) |  | (12,031) |  | (11,618) |  | (12,031) |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Beginning Balance | (10,978) |  | (11,040) |  | (10,978) |  | (11,040) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |
Amounts reclassified from AOCL |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |
Ending Balance | (10,978) |  | (11,040) |  | (10,978) |  | (11,040) |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |
Beginning Balance | 11,413 |  | (312) |  | 2,636 |  | (1,076) |
Other comprehensive income (loss) before reclassifications | 1,626 | [1] | 581 | [2] | 10,403 | [3] | 1,345 | [4]
Amounts reclassified from AOCL |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 1,626 |  | 581 |  | 10,403 |  | 1,345 |
Ending Balance | 13,039 |  | 269 |  | 13,039 |  | 269 |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Beginning Balance | (16,900) |  | (27,209) |  | (21,198) |  | (40,163) |
Other comprehensive income (loss) before reclassifications | 7,343 |  | 4,407 |  | 11,641 |  | 17,361 |
Amounts reclassified from AOCL |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 7,343 |  | 4,407 |  | 11,641 |  | 17,361 |
Ending Balance | $ (9,557) |  | $ (22,802) |  | $ (9,557) |  | $ (22,802) |
[1] | Represents unrealized gains of $2,197, net of tax effect of $(571), for the three months ended September 30, 2018.
[2] | Represents unrealized gains of $954, net of tax effect of $(373), for the three months ended September 30, 2017.
[3] | Represents unrealized gains of $14,057, net of tax effect of $(3,654), for the nine months ended September 30, 2018.
[4] | Represents unrealized gains of $2,208, net of tax effect of $(863), for the nine months ended September 30, 2017.

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