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Quarterly Financial Data (unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data (unaudited) |
Quarterly Financial Data (unaudited) | Note 14. Quarterly Financial Data (unaudited) The following table presents our unaudited quarterly results of operations for the two-year period ended December 31, 2019. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quarter Ended
​ |  | Mar 31, |  | Jun 30, |  | Sep 30, |  | Dec 31, |  | Mar 31, |  | Jun 30, |  | Sep 30, |  | Dec 31,
​ | ​ | 2018 | ​ | 2018 | ​ | 2018 | ​ | 2018 | ​ | 2019 | ​ | 2019 | ​ | 2019 | ​ | 2019
​ | ​ | (in thousands, except per share amounts)
Revenues | ​ | $ | 381,209 | ​ | $ | 397,814 | ​ | $ | 450,698 | ​ | $ | 449,981 | ​ | $ | 466,051 | ​ | $ | 471,395 | ​ | $ | 530,902 | ​ | $ | 548,556
Income before taxes | ​ |  | 141,319 | ​ |  | 147,409 | ​ |  | 179,382 | ​ |  | 172,028 | ​ |  | 174,944 | ​ |  | 160,536 | ​ |  | 193,787 | ​ |  | 206,417
Net income available to common stockholders | ​ |  | 110,651 | ​ |  | 115,211 | ​ |  | 146,574 | ​ |  | 138,399 | ​ |  | 138,094 | ​ |  | 124,034 | ​ |  | 151,943 | ​ |  | 161,092
Earnings per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 1.07 | ​ | $ | 1.11 | ​ | $ | 1.41 | ​ | $ | 1.29 | ​ | $ | 1.24 | ​ | $ | 1.11 | ​ | $ | 1.36 | ​ | $ | 1.43
Diluted | ​ | $ | 1.00 | ​ | $ | 1.04 | ​ | $ | 1.32 | ​ | $ | 1.24 | ​ | $ | 1.23 | ​ | $ | 1.10 | ​ | $ | 1.34 | ​ | $ | 1.42
​ The sum of quarterly earnings per share amounts may not equal the annual amount reported since per share amounts are computed independently for each period presented.

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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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