Weighted Average Common Shares (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Earnings Per Share [Line Items]
Weighted average common shares outstanding (basic) (in shares)	157,217	151,359	153,357	150,476
Weighted average common shares outstanding (diluted) (in shares)	157,263	151,386	153,390	150,863
Contingently issuable common shares
Schedule of Earnings Per Share [Line Items]
Effect of dilutive securities, weighted average number of shares outstanding adjustment (in shares)				360
Unvested share awards
Schedule of Earnings Per Share [Line Items]
Effect of dilutive securities, weighted average number of shares outstanding adjustment (in shares)	46	27	33	27