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Note 6 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Balance | $ 761,261 |  | $ 554,320 |  | $ 397,179
Net current-period other comprehensive income (loss) | (1,104) |  | (2,615) |  | 18,965
Balance | 1,032,851 |  | 761,261 |  | 554,320
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |
Balance | (18,832) |  | (12,856) |  |
Other comprehensive income (loss) before reclassifications | 2,210 |  | (5,976) |  |
Amounts reclassified from AOCL | 0 |  | 0 |  |
Net current-period other comprehensive income (loss) | 2,210 |  | (5,976) |  |
Balance | (16,622) |  | (18,832) |  | (12,856)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |
Balance | (10,541) |  | (10,978) |  |
Other comprehensive income (loss) before reclassifications | 1,474 | [1] | (156) | [2] |
Amounts reclassified from AOCL | 9,067 | [3] | 593 | [4] |
Net current-period other comprehensive income (loss) | 10,541 |  | 437 |  |
Balance | 0 |  | (10,541) |  | (10,978)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |
Balance | 5,560 |  | 2,636 |  |
Other comprehensive income (loss) before reclassifications | (13,855) | [5] | 2,924 | [6] |
Amounts reclassified from AOCL | 0 |  | 0 |  |
Net current-period other comprehensive income (loss) | (13,855) |  | 2,924 |  |
Balance | (8,295) |  | 5,560 |  | 2,636
AOCI Attributable to Parent [Member] |  |  |  |  |
Balance | (23,813) |  | (21,198) |  | (40,163)
Other comprehensive income (loss) before reclassifications | (10,171) |  | (3,208) |  |
Amounts reclassified from AOCL | 9,067 |  | 593 |  |
Net current-period other comprehensive income (loss) | (1,104) |  | (2,615) |  |
Balance | $ (24,917) |  | $ (23,813) |  | $ (21,198)
[1] | Represents unrecognized actuarial gains of $1,992 net of tax effect of $(518), included in the computation of net periodic pension cost for the year ended December 31, 2019. Refer to Note 16, "Benefit Plans," to the consolidated financial statements for additional information.
[2] | Represents unrecognized actuarial losses of $(211), net of tax benefit of $55, included in the computation of net periodic pension cost for the year ended December 31, 2018. Refer to Note 16, "Benefit Plans," to the consolidated financial statements for additional information.
[3] | Details of reclassifications from AOCL during 2019 are as follows: Amounts reclassified from AOCL Loss on pension settlement $ 10,920 Amortization of net loss 843 Total before tax 11,763 Income tax impact (2,696 ) Amounts reclassified from AOCL $ 9,067
[4] | Represents actuarial losses of $802, net of tax effect of $(209), amortized to net periodic pension cost for the year ended December 31, 2018. Refer to Note 16, "Benefit Plans," to the consolidated financial statements for additional information.
[5] | Represents unrealized losses of $(18,732), net of tax effect of $4,877 for the year ended December 31, 2019.
[6] | Represents unrealized gains of $3,951, net of tax effect of $(1,027) for the year ended December 31, 2018.

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