Note 8 - Fair Value Measurements - Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Bank Credit Facility [Member] \| Line of Credit [Member]
Carrying value	$ 741,100	$ 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	2,641,100	2,060,700
Carrying value	2,613,755	2,045,569
Long-term debt	2,592,975	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	741,100	160,700
Carrying value	723,418	156,880
Long-term debt	730,600	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	997,078	996,104
Long-term debt	995,000	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	893,259	892,585
Long-term debt	$ 867,375	$ 877,500