Off-Balance Sheet Arrangements

12 Months Ended

Dec. 31, 2011

Fair Value Off Balance Sheet Risks Disclosure [Abstract]

Off Balance Sheet Arrangements

19. Off-Balance Sheet Arrangements

In October 2005, the Company entered into a forward sale agreement under which it agreed to sell common shares to an affiliate of Citigroup Global Markets Inc., which affiliate is referred to as the forward counterparty, on settlement dates chosen by the Company prior to October 2008. On July 31, 2008, the Company amended the forward sale agreement,with half the contract maturing and the remaining half extended to April 2010.

On April 28, 2010, under the terms of the amendment to the forward sale agreement with the forward counterparty, the remaining forward sale agreement matured. Commencing on April 28, 2010, there was a 40 day valuation period, whereby the Company could deliver up to 3.4 million common shares over the valuation period, subject to a minimum price per share of $59.05 and a maximum price per share of $84.15. As a result of the Company's share price trading between the minimum and the maximum price per share during the valuation period, the Company did not deliver any common shares to the forward counterparty.

This transaction had no other impact on the Company's common shareholders' equity, and the Company's diluted net income per share for the years ended December 31, 2010 and 2009 did not include any dilutive effect related to this agreement.