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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Balance $ 1,097,275 $ 871,011 $ 1,032,851 $ 761,261
Balance 1,229,896 939,215 1,229,896 939,215
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (44,822) (16,673) (16,622) (18,832)
Other comprehensive income (loss) before reclassifications 9,484 (9,811) (18,716) [1] (7,652)
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) 9,484 (9,811) (18,716) (7,652)
Balance (35,338) (26,484) (35,338) (26,484)
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 (27,704) (6,617) (8,295) 5,560
Other comprehensive income (loss) before reclassifications 1,003 [2] (2,721) [3] (18,406) [4] (14,898) [5]
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) 1,003 (2,721) (18,406) (14,898)
Balance (26,701) (9,338) (26,701) (9,338)
AOCI Attributable to Parent [Member]        
Balance (72,526) (33,831) (24,917) (23,813)
Other comprehensive income (loss) before reclassifications 10,487 (12,532) (37,122) (22,550)
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) 10,487 (12,532) (37,122) (22,550)
Balance $ (62,039) $ (46,363) $ (62,039) $ (46,363)
[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 gains of $1,342, net of tax effect of $(339) for the three months ended September 30, 2020.
[3] Represents unrealized losses of $(3,677), net of tax effect of $956 for the three months ended September 30, 2019.
[4] Represents unrealized losses of $(24,623), net of tax effect of $6,217 for the nine months ended September 30, 2020.
[5] Represents unrealized losses of $(20,132), net of tax effect of $5,234 for the nine months ended September 30, 2019.