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Unaudited Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected quarterly financial data | Selected quarterly financial data is presented below.
($ in thousands, except per share data) |  | Three Months Ended
|  | December 31, |  | September 30, |  | June 30, |  | March 31,
2017 |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums written and contract deposits (1) |  | $ | 300,416 |  |  | $ | 318,355 |  |  | $ | 311,614 |  |  | $ | 296,732 |
Total revenues |  | 302,993 |  |  | 289,817 |  |  | 291,436 |  |  | 287,304 |
Net income |  | 125,329 |  |  | 26,551 |  |  | 2,261 |  |  | 15,318 |
Per share information |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Net income (3) |  | $ | 3.03 |  |  | $ | 0.64 |  |  | $ | 0.05 |  |  | $ | 0.37 |
Shares of common stock - weighted average (2) |  | 41,419 |  |  | 41,433 |  |  | 41,368 |  |  | 41,135 |
Diluted |  |  |  |  |  |  |  |
Net income (3) |  | $ | 3.00 |  |  | $ | 0.64 |  |  | $ | 0.05 |  |  | $ | 0.37 |
Shares of common stock and equivalent shares - weighted average (2) |  | 41,718 |  |  | 41,575 |  |  | 41,493 |  |  | 41,342 |
2016 |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums written and contract deposits (1) |  | $ | 315,917 |  |  | $ | 351,534 |  |  | $ | 311,879 |  |  | $ | 283,169 |
Total revenues |  | 282,873 |  |  | 291,176 |  |  | 283,558 |  |  | 271,303 |
Net income |  | 19,823 |  |  | 26,923 |  |  | 11,866 |  |  | 25,153 |
Per share information |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Net income |  | $ | 0.48 |  |  | $ | 0.66 |  |  | $ | 0.29 |  |  | $ | 0.61 |
Shares of common stock - weighted average (2) |  | 41,093 |  |  | 41,092 |  |  | 41,082 |  |  | 41,297 |
Diluted |  |  |  |  |  |  |  |
Net income |  | $ | 0.48 |  |  | $ | 0.65 |  |  | $ | 0.29 |  |  | $ | 0.61 |
Shares of common stock and equivalent shares - weighted average (2) |  | 41,482 |  |  | 41,347 |  |  | 41,314 |  |  | 41,492 |
2015 |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums written and contract deposits (1) |  | $ | 305,186 |  |  | $ | 326,198 |  |  | $ | 319,394 |  |  | $ | 305,735 |
Total revenues |  | 276,106 |  |  | 265,753 |  |  | 268,470 |  |  | 270,119 |
Net income |  | 21,040 |  |  | 21,984 |  |  | 16,183 |  |  | 34,275 |
Per share information |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Net income |  | $ | 0.51 |  |  | $ | 0.53 |  |  | $ | 0.39 |  |  | $ | 0.82 |
Shares of common stock - weighted average (2) |  | 41,564 |  |  | 41,852 |  |  | 41,990 |  |  | 41,950 |
Diluted |  |  |  |  |  |  |  |
Net income |  | $ | 0.50 |  |  | $ | 0.52 |  |  | $ | 0.38 |  |  | $ | 0.81 |
Shares of common stock and equivalent shares - weighted average (2) |  | 42,127 |  |  | 42,305 |  |  | 42,425 |  |  | 42,300 |
____________________
(1) | This measure is not based on accounting principles generally accepted in the U.S. (non-GAAP). An explanation of this measure is contained in the Glossary of Selected Terms included as an exhibit in the Company's reports filed with the SEC.
(2) | Rounded to thousands.
(3) For the three months ended December 31, 2017, net income per basic share of $3.03 and net income per diluted share of $3.00 benefited $2.39 and $2.37, respectively, from the Tax Act.

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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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