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Unaudited Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2019
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,
2019 |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned (1) |  | $ | 240,392 |  |  | $ | 239,681 |  |  | $ | 208,096 |  |  | $ | 209,785 |
Insurance premiums written and contract deposits (1)(2)(3) |  | 346,242 |  |  | 371,216 |  |  | 311,691 |  |  | 295,394 |
Total revenues (1) |  | 331,376 |  |  | 334,418 |  |  | 451,478 |  |  | 313,213 |
Net income (1) |  | 33,001 |  |  | 25,454 |  |  | 93,822 |  |  | 32,166 |
Per share information |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Net income (1) |  | $ | 0.79 |  |  | $ | 0.61 |  |  | $ | 2.25 |  |  | $ | 0.77 |
Shares of common stock - weighted average (4) |  | 41,814 |  |  | 41,785 |  |  | 41,762 |  |  | 41,610 |
Diluted |  |  |  |  |  |  |  |
Net income (1) |  | $ | 0.78 |  |  | $ | 0.60 |  |  | $ | 2.24 |  |  | $ | 0.77 |
Shares of common stock and equivalent shares - weighted average (4) |  | 42,093 |  |  | 42,030 |  |  | 41,921 |  |  | 41,785 |
2018 |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  | $ | 201,905 |  |  | $ | 206,820 |  |  | $ | 205,610 |  |  | $ | 202,998 |
Insurance premiums written and contract deposits (2) |  | 311,216 |  |  | 338,097 |  |  | 301,722 |  |  | 284,008 |
Total revenues |  | 278,535 |  |  | 311,318 |  |  | 306,257 |  |  | 295,489 |
Net income (loss) |  | (20,257 | ) |  | 12,528 |  |  | 5,917 |  |  | 20,155 |
Per share information |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Net income (loss) |  | $ | (0.49 | ) |  | $ | 0.30 |  |  | $ | 0.14 |  |  | $ | 0.49 |
Shares of common stock - weighted average (4) |  | 41,596 |  |  | 41,683 |  |  | 41,600 |  |  | 41,497 |
Diluted |  |  |  |  |  |  |  |
Net income (loss) |  | $ | (0.49 | ) |  | $ | 0.30 |  |  | $ | 0.14 |  |  | $ | 0.48 |
Shares of common stock and equivalent shares - weighted average (4) |  | 41,911 |  |  | 41,850 |  |  | 41,735 |  |  | 41,653 |
2017 |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  | $ | 204,328 |  |  | $ | 198,935 |  |  | $ | 195,718 |  |  | $ | 195,722 |
Insurance premiums written and contract deposits (2) |  | 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 (5) |  | $ | 3.03 |  |  | $ | 0.64 |  |  | $ | 0.05 |  |  | $ | 0.37 |
Shares of common stock - weighted average (4) |  | 41,419 |  |  | 41,433 |  |  | 41,368 |  |  | 41,135 |
Diluted |  |  |  |  |  |  |  |
Net income (5) |  | $ | 3.00 |  |  | $ | 0.64 |  |  | $ | 0.05 |  |  | $ | 0.37 |
Shares of common stock and equivalent shares - weighted average (4) |  | 41,718 |  |  | 41,575 |  |  | 41,493 |  |  | 41,342 |
(1) | See Note 2 for more information regarding the acquisition of NTA on July 1, 2019.
(2) | 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.
(3) | Excludes the annuity reinsurance agreement accounted for under the deposit method that is discussed in Note 6.
(4) | Rounded to thousands.
(5) 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 TCJA.

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