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Capital Structure (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Summary of Authorized and Issued Share Capital | The following table provides a summary of the Company’s authorized and issued share capital as at September 30, 2017 and December 31, 2016:
| As at September 30, 2017 |  | As at December 31, 2016
| Number |  | $ in Thousands |  | Number |  | $ in Thousands
Authorized share capital: |  |  |  |  |  |  |
Ordinary Shares 0.15144558¢ per share | 969,629,030 |  |  | 1,469 |  |  | 969,629,030 |  |  | 1,469 |
Non-Voting Shares 0.15144558¢ per share | 6,787,880 |  |  | 10 |  |  | 6,787,880 |  |  | 10 |
Preference Shares 0.15144558¢ per share | 100,000,000 |  |  | 152 |  |  | 100,000,000 |  |  | 152 |
Total authorized share capital |  |  | 1,631 |  |  |  |  | 1,631 |
Issued share capital: |  |  |  |  |  |  |
Issued ordinary shares of 0.15144558¢ per share | 59,407,323 |  |  | 90 |  |  | 59,774,464 |  |  | 91 |
Issued 7.401% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | — |  |  | — |  |  | 5,327,500 |  |  | 8 |
Issued 7.250% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | — |  |  | — |  |  | 6,400,000 |  |  | 10 |
Issued 5.95% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | 11,000,000 |  |  | 17 |  |  | 11,000,000 |  |  | 17 |
Issued 5.625% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | 10,000,000 |  |  | 15 |  |  | 10,000,000 |  |  | 15 |
Total issued share capital |  |  | 122 |  |  |  |  | 140 |
Summary of Ordinary Shares | The following table summarizes transactions in the Company’s ordinary shares during the nine months ended September 30, 2017:
| Number of Ordinary Shares
Ordinary shares in issue as at December 31, 2016 | 59,774,464 |
Ordinary share transactions in the nine months ended September 30, 2017 |
Ordinary shares issued to employees under the 2013 share incentive plan and/or 2008 share purchase plan | 272,296 |
Ordinary shares issued to non-employee directors | 9,504 |
Ordinary shares repurchased | (648,941 | )
Ordinary shares in issue as at September 30, 2017 | 59,407,323 |

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21553-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
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