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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 666,791 | $ 617,050 | $ 625,590 | $ 639,077 | $ 697,335 | $ 620,932 | $ 633,340 | $ 590,474 |  |  |  |  |  |
Interest income | 184,534 | 169,760 | 154,421 | 137,734 | 126,615 | 117,862 | 108,951 | 100,953 | $ 646,449 |  | $ 454,381 |  | $ 294,332 |
Total revenues | 851,325 | 786,810 | 780,011 | 776,811 | 823,950 | 738,794 | 742,291 | 691,427 | 3,194,957 |  | 2,996,462 |  | 2,642,370 |
Interest expense | 57,876 | 48,468 | 37,279 | 26,453 | 19,865 | 17,625 | 16,644 | 15,896 | 170,076 |  | 70,030 |  | 66,874 |
Net revenues | 793,449 | 738,342 | 742,732 | 750,358 | 804,085 | 721,169 | 725,647 | 675,531 | 3,024,881 | [1] | 2,926,432 | [1] | 2,575,496 | [1]
Total non-interest expenses | 637,518 | 597,812 | 624,385 | 630,804 | 804,905 | 613,030 | 642,449 | 596,512 | 2,490,519 |  | 2,656,896 |  | 2,432,914 |
Income before income tax expense | 155,931 | 140,530 | 118,347 | 119,554 | (820) | 108,139 | 83,198 | 79,019 | 534,362 |  | 269,536 |  | 142,582 |
Provision for income taxes | 41,869 | 36,672 | 31,060 | 30,793 | 1,168 | 41,603 | 30,387 | 13,507 | 140,394 |  | 86,665 |  | 61,062 |
Net income | 114,062 | 103,858 | 87,287 | 88,761 | (1,988) | 66,536 | 52,811 | 65,512 | 393,968 |  | 182,871 |  | 81,520 |
Preferred dividends | 2,344 | 2,343 | 2,344 | 2,344 | 2,344 | 2,343 | 2,344 | 2,344 | 9,375 |  | 9,375 |  | 3,906 |
Net Income available to common shareholders | $ 111,718 | $ 101,515 | $ 84,943 | $ 86,417 | $ (4,332) | $ 64,193 | $ 50,467 | $ 63,168 | $ 384,593 |  | $ 173,496 |  | $ 77,614 |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 1.56 | $ 1.41 | $ 1.18 | $ 1.20 | $ (0.06) | $ 0.94 | $ 0.74 | $ 0.92 | $ 5.36 |  | $ 2.53 |  | $ 1.16 |
Diluted | $ 1.38 | $ 1.25 | $ 1.04 | $ 1.06 | $ (0.06) | $ 0.79 | $ 0.63 | $ 0.78 | $ 4.73 |  | $ 2.14 |  | $ 1.00 |
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 71,666 | 71,919 | 71,692 | 71,999 | 68,782 | 68,522 | 68,556 | 68,386 | 71,786 |  | 68,562 |  | 66,871 |
Diluted | 80,706 | 81,484 | 81,299 | 81,789 | 68,782 | 80,881 | 80,021 | 80,695 | 81,321 |  | 81,035 |  | 77,563 |
Cash dividends declared per common share | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.10 | $ 0.10 |  |  | $ 0.48 |  | $ 0.20 |  | $ 0 |
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2018, 2017, and 2016.

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