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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Balance $ 1,655,938 $ 1,097,275 $ 1,390,204 $ 1,032,851
Balance 1,782,277 1,229,896 1,782,277 1,229,896
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (27,246) (44,822) (11,674) (16,622)
Other comprehensive income (loss) before reclassifications (20,899) [1] 9,484 (36,471) [2] (18,716) [3]
Amounts reclassified from AOCL       0
Net current-period other comprehensive income (loss) (20,899) 9,484 (36,471) (18,716)
Balance (48,145) (35,338) (48,145) (35,338)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance (10,337) (27,704) (22,580) (8,295)
Other comprehensive income (loss) before reclassifications 2,941 [4] 1,003 [5] 15,184 [6] (18,406) [7]
Amounts reclassified from AOCL       0
Net current-period other comprehensive income (loss) 2,941 1,003 15,184 (18,406)
Balance (7,396) (26,701) (7,396) (26,701)
AOCI Attributable to Parent [Member]        
Balance (37,583) (72,526) (34,254) (24,917)
Other comprehensive income (loss) before reclassifications (17,958) 10,487 (21,287) (37,122)
Amounts reclassified from AOCL 0     0
Net current-period other comprehensive income (loss) (17,958) 10,487 (21,287) (37,122)
Balance $ (55,541) $ (62,039) $ (55,541) $ (62,039)
[1] Represents unfavorable impact from the strengthening of the U.S. dollar against foreign currencies during the three months ended September 30, 2021, particularly the Euro and British Pound.
[2] Represents unfavorable impact from the strengthening of the U.S. dollar against foreign currencies during the nine months ended September 30, 2021, particularly the Euro and British Pound.
[3] Represents unfavorable impact from the strengthening of the U.S. dollar against foreign currencies during the nine months ended September 30, 2020, particularly the Mexican Peso, Euro, Brazilian Real, and Russian Ruble.
[4] Represents unrealized gains of $3,934 on the interest rate swaps, net of tax effect of $(993) for the three months ended September 30, 2021.
[5] Represents unrealized gains of $1,342 on the interest rate swaps, net of tax effect of $(339) for the three months ended September 30, 2020.
[6] Represents unrealized gains of $20,312 on the interest rate swaps, net of tax effect of $(5,128) for the nine months ended September 30, 2021.
[7] Represents unrealized losses of $(24,623) on the interest rate swaps, net of tax effect of $6,217 for the nine months ended September 30, 2020.