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Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 626,581 $ 622,249 $ 607,852 $ 604,593 $ 602,218 $ 593,106 $ 606,119 $ 551,274 $ 2,461,275 $ 2,352,717 $ 2,027,877
Operating income 70,938 73,070 65,599 73,056 48,200 82,138 88,095 87,162 282,663 305,595 226,005
Net income $ 55,589 $ 50,172 $ 48,174 $ 56,747 $ 29,061 $ 60,422 $ 64,598 $ 62,645 $ 210,682 $ 216,726 $ 150,611
Earnings per common share — basic (in dollars per share) $ 1.63 $ 1.41 $ 1.33 $ 1.56 $ 0.80 $ 1.65 $ 1.75 $ 1.69 $ 5.92 $ 5.89 $ 4.06
Earnings per common share — diluted (in dollars per share) $ 1.57 $ 1.35 $ 1.27 $ 1.49 $ 0.76 $ 1.59 $ 1.69 $ 1.64 $ 5.67 $ 5.69 $ 3.93
Weighted average common shares outstanding                      
Basic (in shares) 34,198 35,639 36,169 36,415 36,545 36,617 36,960 36,981 35,602 36,774 37,098
Diluted (in shares) 35,484 37,086 37,852 38,190 38,126 37,938 38,168 38,219 37,149 38,111 38,318