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 June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Net income available to common unitholders	$	28,408	$	119,432	$	68,196	$	223,186
Weighted average units outstanding—basic	149,226,714		138,567,526		149,137,258		138,487,704
Potentially dilutive common units:
Stock options	11,588		30,601		10,887		31,402
Unvested incentive units	77,946		68,371		70,664		55,742
Forward equity offering	347,277		—		—		—
Market performance-based awards	547,189		589,972		640,467		416,267
Weighted average units outstanding—diluted	150,210,714		139,256,470		149,859,276		138,991,115
Income per unit:
Basic	$	0.19	$	0.86	$	0.46	$	1.61
Diluted	$	0.19	$	0.86	$	0.46	$	1.61

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



	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Potentially dilutive Series E Cumulative Redeemable Preferred Units	2,807,321	4,360,736	3,076,204	4,376,813
Potentially dilutive Series F Cumulative Redeemable Preferred Units	1,780,397	2,765,569	1,950,922	2,775,765
Potentially dilutive Series G Cumulative Redeemable Preferred Units	2,434,401	3,781,463	2,667,567	3,795,404
Potentially dilutive Series H Cumulative Redeemable Preferred Units	3,567,361	5,541,340	3,909,041	5,561,769
Potentially dilutive Series I Cumulative Redeemable Preferred Units	2,437,250	—	2,670,688	—
Units subject to forward equity offering	—	—	14,375,000	—
	13,026,730	16,449,108	28,649,422	16,509,751