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Note 14 - Quarterly Financial Information (Unaudited) - Operating Results by Quarter (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 2,317,842	$ 2,209,760	$ 2,139,027	$ 1,948,245	$ 1,990,160	$ 1,843,334	$ 1,726,915	$ 1,629,158	$ 8,614,874	$ 7,189,568	$ 6,555,459
Operating income	122,740	174,688	214,812	168,781	145,814	164,972	163,615	149,389	681,021	623,789	721,020
Net earnings	$ 88,681	$ 131,110	$ 151,652	$ 118,142	$ 385,308	$ 100,385	$ 97,869	$ 102,702	$ 489,585	$ 686,263	$ 432,090
Basic earnings per share (in dollars per share)	$ 0.81	$ 1.20	$ 1.39	$ 1.08	$ 3.51	$ 0.92	$ 0.89	$ 0.93	$ 4.48	$ 6.24	$ 3.84
Diluted earnings per share (in dollars per share)	$ 0.81	$ 1.19	$ 1.37	$ 1.07	$ 3.48	$ 0.91	$ 0.88	$ 0.92	$ 4.43	$ 6.18	$ 3.81

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