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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Balance | $ 871,011 |  | $ 617,255 |  | $ 761,261 |  | $ 554,320 |
Balance | 939,215 |  | 698,635 |  | 939,215 |  | 698,635 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Balance | (16,673) |  | (17,335) |  | (18,832) |  | (12,856) |
Other comprehensive loss before reclassifications | (9,811) |  | 5,717 |  | (7,652) |  | 1,238 |
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive loss | (9,811) |  | 5,717 |  | (7,652) |  | 1,238 |
Balance | (26,484) |  | (11,618) |  | (26,484) |  | (11,618) |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Balance | (10,541) |  | (10,978) |  | (10,541) |  | (10,978) |
Other comprehensive loss before reclassifications | 0 |  | 0 |  | 0 |  | 0 |
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive 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 | (6,617) |  | 11,413 |  | 5,560 |  | 2,636 |
Other comprehensive loss before reclassifications | (2,721) | [1] | 1,626 | [2] | (14,898) | [3] | 10,403 | [4]
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive loss | (2,721) |  | 1,626 |  | (14,898) |  | 10,403 |
Balance | (9,338) |  | 13,039 |  | (9,338) |  | 13,039 |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Balance | (33,831) |  | (16,900) |  | (23,813) |  | (21,198) |
Other comprehensive loss before reclassifications | (12,532) |  | 7,343 |  | (22,550) |  | 11,641 |
Amounts reclassified from AOCL | 0 |  | 0 |  | 0 |  | 0 |
Net current-period other comprehensive loss | (12,532) |  | 7,343 |  | (22,550) |  | 11,641 |
Balance | $ (46,363) |  | $ (9,557) |  | $ (46,363) |  | $ (9,557) |
[1] | Represents unrealized losses of $(3,677), net of tax effect of $956, for the three months ended September 30, 2019.
[2] | Represents unrealized gains of $2,197, net of tax effect of $(571), for the three months ended September 30, 2018.
[3] | Represents unrealized losses of $(20,132), net of tax effect of $5,234, for the nine months ended September 30, 2019.
[4] | Represents unrealized gains of $14,057, net of tax effect of $(3,654), for the nine months ended September 30, 2018.

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