Income per Unit

The following is a summary of basic and diluted income per unit (in thousands, except unit and per unit amounts):



	Three Months Ended March 31,
	2019		2018
Net income available to common unitholders	$	100,169	$	89,778
Weighted average units outstanding—basic	217,039,295		214,009,460
Potentially dilutive common units:
Unvested incentive units	323,064		302,016
Forward equity offering	221,448		—
Market performance-based awards	172,354		491,287
Weighted average units outstanding—diluted	217,756,161		214,802,763
Income per unit:
Basic	$	0.46	$	0.42
Diluted	$	0.46	$	0.42

We have excluded the following potentially dilutive securities in the calculations above as they would be antidilutive or not dilutive:



	Three Months Ended March 31,
	2019	2018
Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Units	1,738,781	1,967,430
Potentially dilutive Series G Cumulative Redeemable Preferred Units	2,155,992	2,439,505
Potentially dilutive Series H Cumulative Redeemable Preferred Units	3,159,382	3,574,840
Potentially dilutive Series I Cumulative Redeemable Preferred Units	2,158,515	2,442,359
Potentially dilutive Series J Cumulative Redeemable Preferred Units	1,722,138	1,948,598
Potentially dilutive Series K Cumulative Redeemable Preferred Units	358,008	—
Total	11,292,816	12,372,732