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Note 6 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Balance | $ 809,955 |  | $ 570,194 |  | $ 761,261 |  | $ 554,320 |
Balance | 871,011 |  | 617,255 |  | 871,011 |  | 617,255 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Balance | (19,765) |  | (6,677) |  | (18,832) |  | (12,856) |
Other comprehensive income (loss) before reclassifications | 3,092 |  | (10,658) |  | 2,159 |  | (4,479) |
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive income (loss) | 3,092 |  | (10,658) |  | 2,159 |  | (4,479) |
Balance | (16,673) |  | (17,335) |  | (16,673) |  | (17,335) |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Balance | (10,541) |  | (10,978) |  | (10,541) |  | (10,978) |
Other comprehensive income (loss) before reclassifications | 0 |  | 0 |  | 0 |  | 0 |
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive income (loss) | 0 |  | 0 |  | 0 |  | 0 |
Balance | (10,541) |  | (10,978) |  | (10,541) |  | (10,978) |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |
Balance | 436 |  | 9,283 |  | 5,560 |  | 2,636 |
Other comprehensive income (loss) before reclassifications | (7,053) | [1] | 2,130 | [2] | (12,177) | [3] | 8,777 | [4]
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive income (loss) | (7,053) |  | 2,130 |  | (12,177) |  | 8,777 |
Balance | (6,617) |  | 11,413 |  | (6,617) |  | 11,413 |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Balance | (29,870) |  | (8,372) |  | (23,813) |  | (21,198) |
Other comprehensive income (loss) before reclassifications | (3,961) |  | (8,528) |  | (10,018) |  | 4,298 |
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive income (loss) | (3,961) |  | (8,528) |  | (10,018) |  | 4,298 |
Balance | $ (33,831) |  | $ (16,900) |  | $ (33,831) |  | $ (16,900) |
[1] | Represents unrealized losses of $(9,531), net of tax effect of $2,478 for the three months ended June 30, 2019.
[2] | Represents unrealized gains of $2,878, net of tax effect of $(748), for the three months ended June 30, 2018.
[3] | Represents unrealized losses of $(16,455), net of tax effect of $4,278 for the six months ended June 30, 2019.
[4] | Represents unrealized gains of $11,860, net of tax effect of $(3,083), for the six months ended June 30, 2018.

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