Note 8 - Fair Value Measurements - Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Carrying value	$ 2,700,900
Bank Credit Facility [Member] \| Line of Credit [Member]
Carrying value	800,900	$ 160,700
Senior Note 4750 Due 2031 Member \| Senior Notes [Member]
Carrying value	900,000	900,000
Fair Value, Nonrecurring [Member]
Debt Instrument, Face Amount	2,700,900	2,060,700
Carrying value	2,675,106	2,045,569
Long-term debt	2,618,275	2,034,450
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Bank Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument, Face Amount	800,900	160,700
Carrying value	783,945	156,880
Long-term debt	792,400	160,700
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| The 4.750% Senior NotesDue December 2027 [Member] \| Senior Notes [Member]
Debt Instrument, Face Amount	1,000,000	1,000,000
Carrying value	997,565	996,104
Long-term debt	990,000	996,250
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Senior Note 4750 Due 2031 Member \| Senior Notes [Member]
Debt Instrument, Face Amount	900,000	900,000
Carrying value	893,596	892,585
Long-term debt	$ 835,875	$ 877,500