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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Balance $ 1,023,687 $ 809,955 $ 1,032,851 $ 761,261
Balance 1,097,275 871,011 1,097,275 871,011
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (49,836) (19,765) (16,622) (18,832)
Other comprehensive income (loss) before reclassifications 5,014 3,092 (28,200) [1] 2,159
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) 5,014 3,092 (28,200) 2,159
Balance (44,822) (16,673) (44,822) (16,673)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance 0 (10,541)   (10,541)
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 0 (10,541) 0 (10,541)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance (24,108) 436 (8,295) 5,560
Other comprehensive income (loss) before reclassifications (3,596) [2] (7,053) [3] (19,409) [4] (12,177) [5]
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) (3,596) (7,053) (19,409) (12,177)
Balance (27,704) (6,617) (27,704) (6,617)
AOCI Attributable to Parent [Member]        
Balance (73,944) (29,870) (24,917) (23,813)
Other comprehensive income (loss) before reclassifications 1,418 (3,961) (47,609) (10,018)
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) 1,418 (3,961) (47,609) (10,018)
Balance $ (72,526) $ (33,831) $ (72,526) $ (33,831)
[1] Represents the unfavorable impact from the strengthening of the U.S. dollar against foreign currencies during the six months ended June 30, 2020, particularly the Mexican Peso, Euro, Brazilian Real, and Russian Ruble.
[2] Represents unrealized losses of $(4,811), net of tax effect of $1,215 for the three months ended June 30, 2020.
[3] Represents unrealized losses of $(9,531), net of tax effect of $2,478 for the three months ended June 30, 2019.
[4] Represents unrealized losses of $(25,965), net of tax effect of $6,556 for the six months ended June, 30, 2020.
[5] Represents unrealized losses of $(16,455), net of tax effect of $4,278 for the six months ended June 30, 2019.