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Capital Structure (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2017 and 2016:
 
 
As at December 31, 2017
 
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
 
59,474,085

 
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 years ended December 31, 2017 and 2016:
 
 
Number of Ordinary Shares
 
 
2017
 
2016
Ordinary shares in issue at the beginning of the year
 
59,774,464

 
60,918,373

Ordinary shares issued to employees under the 2003 and 2013 share incentive plans and/or 2008 share purchase plan
 
309,727

 
419,255

Ordinary shares issued to non-employee directors
 
38,835

 
32,241

Ordinary shares repurchased
 
(648,941
)
 
(1,595,405
)
Ordinary shares in issue at the end of the year
 
59,474,085

 
59,774,464