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Note 16 - Unaudited Quarterly Financial Data - Quarterly Financial Data (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 $ 1,268,197 $ 1,178,568 $ 1,002,512 $ 1,286,663 $ 1,317,704 $ 1,599,265 $ 1,544,561 $ 1,348,317 $ 4,735,940 $ 5,809,847 $ 5,506,190
Gross profit 236,183 212,452 192,331 234,501 234,438 264,768 269,506 256,916 875,467 1,025,628 978,269
Operating income 53,539 42,868 23,001 35,197 39,423 58,323 61,792 56,867 154,605 216,405 202,851
Income before income taxes 53,614 43,928 22,512 31,669 33,345 52,210 54,410 49,558 151,723 189,523 183,169
Net income $ 41,025 $ 33,939 $ 16,816 $ 23,107 $ 23,754 $ 39,104 $ 41,621 $ 37,104 $ 114,887 $ 141,583 $ 139,062
Basic (in dollars per share) $ 0.74 $ 0.62 $ 0.31 $ 0.42 $ 0.43 $ 0.71 $ 0.75 $ 0.67 $ 2.09 $ 2.57 $ 2.36
Diluted (in dollars per share) $ 0.72 $ 0.60 $ 0.30 $ 0.41 $ 0.42 $ 0.70 $ 0.74 $ 0.65 $ 2.04 $ 2.51 $ 2.30