8. 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,
	2013	2012	2013	2012

Net income available to common unitholders	$ 48,013	$ 43,682	$ 91,494	$ 84,479

Weighted average units outstanding--basic	130,973,952	114,100,498	129,936,759	112,766,660
Potentially dilutive common units:
Stock options	68,146	195,635	69,304	193,775
Class C Units (2007 Grant)	-	1,334	-	-
Unvested incentive units	135,185	208,096	120,222	185,362
Weighted average units outstanding--diluted	131,177,283	114,505,563	130,126,285	113,145,797
Income per unit:
Basic	$ 0.37	$ 0.38	$ 0.70	$ 0.75
Diluted	$ 0.37	$ 0.38	$ 0.70	$ 0.75

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,
	2013	2012	2013	2012

Potentially dilutive 2029 Debentures	6,609,993	6,456,471	6,600,286	6,449,278
Potentially dilutive Series C Cumulative Convertible Preferred Units	-	489,298	-	1,637,072
Potentially dilutive Series D Cumulative Convertible Preferred Units	-	4,374,117	949,299	4,355,773
Potentially dilutive Series E Cumulative Redeemable Preferred Units	4,929,167	3,959,975	4,655,435	3,992,679
Potentially dilutive Series F Cumulative Redeemable Preferred Units	3,126,066	2,509,588	2,952,466	1,185,849
Potentially dilutive Series G Cumulative Redeemable Preferred Units	3,893,598	-	1,957,555	-
	18,558,824	17,789,449	17,115,041	17,620,651