Consolidated Statements of Equity (Parenthetical) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Balance (in units/ shares)	94,661,381	94,536,269
Conversion of common units to common shares (in units/ shares)	0	158,000
Exercise of share options (in units/shares)		70,374
Share-based compensation issuance, net of redemptions (in units/shares)	129,869	162,370
Common Shares
Issuance of common units resulting from common shares issued under at-the-market program (in units)		890,241