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Share capital
6 Months Ended
Jun. 30, 2015
Equity [Abstract]  
Share capital
Authorized and issued
The Company’s authorized share capital of $33.0 million is comprised of 300,000,000 common shares with a par value of $0.10 each and 30,000,000 preference shares with a par value of $0.10 each. As of June 30, 2015, 105,262,341 common shares were issued and outstanding. No preference shares have been issued to date.