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,
	2018		2017
Net income available to common unitholders	$	89,778	$	67,049
Weighted average units outstanding—basic	214,009,460		161,474,901
Potentially dilutive common units:
Stock options	—		4
Unvested incentive units	302,016		237,336
Forward equity offering	—		283,388
Market performance-based awards	491,287		603,900
Weighted average units outstanding—diluted	214,802,763		162,599,529
Income per unit:
Basic	$	0.42	$	0.42
Diluted	$	0.42	$	0.41

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,
	2018	2017
Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Units	1,967,430	—
Potentially dilutive Series F Cumulative Redeemable Preferred Units	—	1,783,083
Potentially dilutive Series G Cumulative Redeemable Preferred Units	2,439,505	2,438,074
Potentially dilutive Series H Cumulative Redeemable Preferred Units	3,574,840	3,572,744
Potentially dilutive Series I Cumulative Redeemable Preferred Units	2,442,359	2,440,928
Potentially dilutive Series J Cumulative Redeemable Preferred Units	1,948,598	—
Total	12,372,732	10,234,829