Share capital (Tables)

6 Months Ended

Jun. 30, 2011

Share capital [Abstract]

Summarization of common shares issued and outstanding

	Common Shares
Common shares issued, December 31, 2010		132,838,111
Restricted share awards vested, net of shares withheld		458,933
Restricted share units vested, net of shares withheld		9,496
Employee seller shares vested		—
Options exercised		455,033
Warrants exercised		34,340
Common shares issued, June 30, 2011		133,795,913
Shares repurchased		(35,031,985	)
Common shares outstanding, June 30, 2011		98,763,928

	Common Shares
Common shares issued, December 31, 2009		131,616,349
Restricted share awards vested, net of shares withheld		281,512
Restricted share units vested, net of shares withheld		57,192
Employee seller shares vested		—
Options exercised		51,534
Warrants exercised		—
Common shares issued, June 30, 2010		132,006,587
Shares repurchased		(20,598,594	)
Common shares outstanding, June 30, 2010		111,407,993