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Quarterly Financial Data (unaudited) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (unaudited) | Quarterly Financial Data (unaudited)
| Quarter Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
2020 |  |  |  |  |  |  |
Revenues | $ | 604,593 |  |  | $ | 607,852 |  |  | $ | 622,249 |  |  | $ | 626,581 |
Operating income | $ | 73,056 |  |  | $ | 65,599 |  |  | $ | 73,070 |  |  | $ | 70,938 |
Net income | $ | 56,747 |  |  | $ | 48,174 |  |  | $ | 50,172 |  |  | $ | 55,589 |
Earnings per common share — basic (1) | $ | 1.56 |  |  | $ | 1.33 |  |  | $ | 1.41 |  |  | $ | 1.63 |
Earnings per common share — diluted (1) | $ | 1.49 |  |  | $ | 1.27 |  |  | $ | 1.35 |  |  | $ | 1.57 |
Weighted average common shares outstanding |  |  |  |  |  |  |
Basic | 36,415 |  |  | 36,169 |  |  | 35,639 |  |  | 34,198 |
Diluted | 38,190 |  |  | 37,852 |  |  | 37,086 |  |  | 35,484 |
| Quarter Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
2019 |  |  |  |  |  |  |
Revenues | $ | 551,274 |  |  | $ | 606,119 |  |  | $ | 593,106 |  |  | $ | 602,218 |
Operating income | $ | 87,162 |  |  | $ | 88,095 |  |  | $ | 82,138 |  |  | $ | 48,200 |
Net income | $ | 62,645 |  |  | $ | 64,598 |  |  | $ | 60,422 |  |  | $ | 29,061 |
Earnings per common share — basic (1) | $ | 1.69 |  |  | $ | 1.75 |  |  | $ | 1.65 |  |  | $ | 0.80 |
Earnings per common share — diluted (1) | $ | 1.64 |  |  | $ | 1.69 |  |  | $ | 1.59 |  |  | $ | 0.76 |
Weighted average common shares outstanding |  |  |  |  |  |  |
Basic | 36,981 |  |  | 36,960 |  |  | 36,617 |  |  | 36,545 |
Diluted | 38,219 |  |  | 38,168 |  |  | 37,938 |  |  | 38,126 |
(1)The sum of the quarterly earnings per share amounts may not equal the annual amounts due to changes in the weighted average number of common shares outstanding during each quarterly period.

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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