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Note 12 - Quarterly Financial Information (Unaudited) - Operating Results by Quarter (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating revenues	$ 1,721,062	$ 1,690,659	$ 1,615,026	$ 1,528,712	$ 1,621,015	$ 1,586,494	$ 1,539,957	$ 1,440,180	$ 6,555,459	$ 6,187,646	$ 6,165,441
Operating income	194,361	182,977	175,792	167,890	192,893	193,846	173,735	155,220	721,020	715,694	631,542
Net earnings	$ 117,556	$ 109,425	$ 105,011	$ 100,098	$ 116,746	$ 115,139	$ 103,419	$ 91,932	$ 432,090	$ 427,235	$ 374,792
Basic earnings per share (in dollars per share)	$ 1.05	$ 0.97	$ 0.93	$ 0.89	$ 1.02	$ 1	$ 0.89	$ 0.79	$ 3.84	$ 3.69	$ 3.20
Diluted earnings per share (in dollars per share)	$ 1.05	$ 0.97	$ 0.92	$ 0.88	$ 1.01	$ 0.99	$ 0.88	$ 0.78	$ 3.81	$ 3.66	$ 3.16

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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