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Quarterly Operating Results (Notes) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] | Quarterly Operating Results (Unaudited) Quarterly operating results for 2017 and 2016 were as follows:
(in thousands, except per share data) |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |
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 |  | $ | 0.50 |  |  | $ | 0.47 |  |  | $ | 0.54 |  |  | $ | 1.35 |  |
Diluted |  | $ | 0.49 |  |  | $ | 0.46 |  |  | $ | 0.53 |  |  | $ | 1.32 |  | (1)
2016 |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 424,173 |  |  | $ | 446,518 |  |  | $ | 462,274 |  |  | $ | 433,664 |  |
Total expenses |  | $ | 321,624 |  |  | $ | 337,441 |  |  | $ | 345,302 |  |  | $ | 338,763 |  |
Income before income taxes |  | $ | 102,549 |  |  | $ | 109,077 |  |  | $ | 116,972 |  |  | $ | 94,901 |  |
Net income |  | $ | 62,070 |  |  | $ | 66,250 |  |  | $ | 71,545 |  |  | $ | 57,626 |  |
Net income per share: |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.45 |  |  | $ | 0.47 |  |  | $ | 0.51 |  |  | $ | 0.41 |  |
Diluted |  | $ | 0.44 |  |  | $ | 0.47 |  |  | $ | 0.50 |  |  | $ | 0.41 |  |
(1) | Includes $0.85 impact associated with recording impact of Tax Reform Act.
Quarterly financial results are affected by seasonal variations. The timing of the Company’s receipt of profit-sharing contingent commissions, policy renewals and acquisitions may cause revenues, expenses and net income to vary significantly between quarters.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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