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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance $ 1,524,569 $ 1,023,687 $ 1,390,204 $ 1,032,851
Balance 1,655,938 1,097,275 1,655,938 1,097,275
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (23,914) (49,836) (11,674) (16,622)
Other comprehensive income (loss) before reclassifications (3,332) 5,014 (15,572) [1] (28,200) [2]
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) (3,332) 5,014 (15,572) (28,200)
Balance (27,246) (44,822) (27,246) (44,822)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance (7,585) (24,108) (22,580) (8,295)
Other comprehensive income (loss) before reclassifications (2,752) [3] (3,596) [4] 12,243 [5] (19,409) [6]
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) (2,752) (3,596) 12,243 (19,409)
Balance (10,337) (27,704) (10,337) (27,704)
AOCI Attributable to Parent [Member]        
Balance (31,499) (73,944) (34,254) (24,917)
Other comprehensive income (loss) before reclassifications (6,084) 1,418 (3,329) (47,609)
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) (6,084) 1,418 (3,329) (47,609)
Balance $ (37,583) $ (72,526) $ (37,583) $ (72,526)
[1] Represents unfavorable impact from the strengthening of the U.S. dollar against foreign currencies during the six months ended June 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 six months ended June 30, 2020, particularly the Mexican Peso, Euro, Brazilian Real, and Russian Ruble.
[3] Represents unrealized losses of $(3,682) on the interest rate swaps, net of tax effect of $930 for the three months ended June 30, 2021.
[4] Represents unrealized losses of $(4,811) on the interest rate swaps, net of tax effect of $1,215 for the three months ended June 30, 2020.
[5] Represents unrealized gains of $16,379 on the interest rate swaps, net of tax effect of $(4,136) for the six months ended June 30, 2021.
[6] Represents unrealized losses of $(25,965) on the interest rate swaps, net of tax effect of $6,556 for the six months ended June 30, 2020.