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Quarterly Operating Results (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | Quarterly operating results for 2018 and 2017 were as follows:
(in thousands, except per share data) |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 501,461 |  |  | $ | 473,187 |  |  | $ | 530,850 |  |  | $ | 508,748 |  |
Total expenses |  | $ | 383,020 |  |  | $ | 372,277 |  |  | $ | 388,350 |  |  | $ | 408,137 |  |
Income before income taxes |  | $ | 118,441 |  |  | $ | 100,910 |  |  | $ | 142,500 |  |  | $ | 100,611 |  |
Net income |  | $ | 90,828 |  |  | $ | 73,922 |  |  | $ | 106,053 |  |  | $ | 73,452 |  |
Net income per share: |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.33 |  |  | $ | 0.27 |  |  | $ | 0.38 |  |  | $ | 0.26 |  |
Diluted |  | $ | 0.32 |  |  | $ | 0.26 |  |  | $ | 0.38 |  |  | $ | 0.26 |  |
2017 |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 465,080 |  |  | $ | 466,305 |  |  | $ | 475,646 |  |  | $ | 474,316 |  |
Total expenses |  | $ | 354,113 |  |  | $ | 358,303 |  |  | $ | 351,227 |  |  | $ | 367,982 |  |
Income before income taxes |  | $ | 110,967 |  |  | $ | 108,002 |  |  | $ | 124,419 |  |  | $ | 106,334 |  |
Net income |  | $ | 70,110 |  |  | $ | 66,102 |  |  | $ | 75,913 |  |  | $ | 187,505 |  |
Net income per share: |  |  |  |  |  |  |  |  |
Basic(1) |  | $ | 0.25 |  |  | $ | 0.24 |  |  | $ | 0.27 |  |  | $ | 0.68 |  |
Diluted(1) |  | $ | 0.25 |  |  | $ | 0.23 |  |  | $ | 0.27 |  |  | $ | 0.66 |  | (2)

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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