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Note 15 - Quarterly Financial Information (Unaudited) - Operating Results by Quarter (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 2,737,652	$ 2,472,523	$ 2,145,573	$ 2,280,826	$ 2,450,323	$ 2,363,660	$ 2,261,647	$ 2,089,627	$ 9,636,573	$ 9,165,258	$ 8,614,874
Operating income	207,691	175,503	175,183	154,741	205,074	167,862	193,093	167,795	713,119	733,825	681,021
Net earnings	$ 154,007	$ 125,496	$ 121,698	$ 104,834	$ 144,676	$ 118,410	$ 133,633	$ 119,601	$ 506,035	$ 516,320	$ 489,585
Basic earnings per share (in dollars per share)	$ 1.46	$ 1.19	$ 1.15	$ 0.99	$ 1.36	$ 1.11	$ 1.24	$ 1.10	$ 4.79	$ 4.81	$ 4.48
Diluted earnings per share (in dollars per share)	$ 1.44	$ 1.18	$ 1.14	$ 0.98	$ 1.35	$ 1.10	$ 1.23	$ 1.09	$ 4.74	$ 4.77	$ 4.43

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