Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Class A preferred shares, shares issued	0	0
Class A preferred shares, shares outstanding	0	0
Common shares, without par value	$ 0	$ 0
Common shares, Shares issued	130,188,775	129,365,076
Common shares, Shares outstanding	130,188,775	129,365,076