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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
Mar. 31, 2021
Mar. 31, 2020
Balance $ 1,390,204 $ 1,032,851
Balance 1,524,569 1,023,687
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (11,674) (16,622)
Other comprehensive income (loss) before reclassifications (12,240) (33,214) [1]
Amounts reclassified from AOCL 0 0
Net current-period other comprehensive income (loss) (12,240) (33,214)
Balance (23,914) (49,836)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance (22,580) (8,295)
Other comprehensive income (loss) before reclassifications 14,995 [2] (15,813) [3]
Amounts reclassified from AOCL 0 0
Net current-period other comprehensive income (loss) 14,995 (15,813)
Balance (7,585) (24,108)
AOCI Attributable to Parent [Member]    
Balance (34,254) (24,917)
Other comprehensive income (loss) before reclassifications 2,755 (49,027)
Amounts reclassified from AOCL 0 0
Net current-period other comprehensive income (loss) 2,755 (49,027)
Balance $ (31,499) $ (73,944)
[1] Represents unfavorable impact from the strengthening of the U.S. dollar against foreign currencies during the three months ended March 31, 2020, particularly the Mexican Peso, Euro, Brazilian Real, and Russian Ruble.
[2] Represents unrealized gains of $20,060, net of tax effect of $(5,065) for the three months ended March 31, 2021.
[3] Represents unrealized losses of $(21,154), net of tax effect of $5,341 for the three months ended March 31, 2020.