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Capital Structure | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Capital Structure | Capital Structure The following table provides a summary of the Company’s authorized and issued share capital as at June 30, 2018 and December 31, 2017:
| As at June 30, 2018 |  | As at December 31, 2017
| 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 | 59,687,717 |  |  | 90 |  |  | 59,474,085 |  |  | 90 |
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 |  |  |  |  | 122 |
Additional paid-in capital as at June 30, 2018 was $965.4 million (December 31, 2017 — $954.7 million). Additional paid-in capital includes the aggregate liquidation preferences of the Company’s preference shares of $525.0 million (December 31, 2017 — $525.0 million) less issue costs of $13.1 million (December 31, 2017 — $13.1 million). Ordinary Shares. The following table summarizes transactions in the Company’s ordinary shares during the six months ended June 30, 2018:
| Number of Ordinary Shares
Ordinary shares in issue as at December 31, 2017 | 59,474,085 |
Ordinary share transactions in the six months ended June 30, 2018 |
Ordinary shares issued to employees under the 2013 share incentive plan and/or 2008 share purchase plan | 208,954 |
Ordinary shares issued to non-employee directors | 4,678 |
Ordinary shares in issue as at June 30, 2018 | 59,687,717 |
Share Repurchase Authorization Program. On February 8, 2017, the Company’s Board of Directors approved a share repurchase authorization program of $250.0 million. The share repurchase authorization program, which expires on February 8, 2019, permits the Company to effect the repurchases of its ordinary shares from time to time through a combination of transactions, including open market purchases, privately negotiated transactions and accelerated share repurchase transactions. The Company did not acquire or cancel any ordinary shares for the three and six months ended June 30, 2018. For the three and six months ended June 30, 2017, the Company acquired and canceled 197,673 ordinary shares for a total consideration of $10.0 million. Preference Share Issuance. The Company did not issue any preference shares for the three and six months ended June 30, 2018.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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