Equity (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Common shares at beginning of period	30,709,877	30,682
Issuance of common shares	7,475	0
Issuance of restricted shares	376	37
Forfeiture of restricted shares	(3)	(9)
Common shares at end of period	38,558,048	30,709,877