Income per Share

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



	Year Ended December 31,
	2018		2017		2016
Net income available to common stockholders	$	249,930	$	173,148	$	332,088
Weighted average shares outstanding—basic	206,035,408		174,059,386		149,953,662
Potentially dilutive common shares:
Stock options	—		—		9,726
Unvested incentive units	141,260		141,136		71,031
Forward equity offering	33,315		124,527		3,990
Market performance-based awards	463,488		570,049		641,279
Weighted average shares outstanding—diluted	206,673,471		174,895,098		150,679,688
Income per share:
Basic	$	1.21	$	0.99	$	2.21
Diluted	$	1.21	$	0.99	$	2.20

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



	Year Ended December 31,
	2018	2017	2016
Weighted average of Operating Partnership common units not owned by Digital Realty Trust, Inc.	8,227,463	3,996,550	2,406,018
Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Stock	1,876,584	540,773	—
Potentially dilutive Series E Cumulative Redeemable Preferred Stock	—	—	2,880,254
Potentially dilutive Series F Cumulative Redeemable Preferred Stock	—	463,301	1,939,905
Potentially dilutive Series G Cumulative Redeemable Preferred Stock	2,326,861	2,261,153	2,652,503
Potentially dilutive Series H Cumulative Redeemable Preferred Stock	3,409,772	3,313,484	3,886,966
Potentially dilutive Series I Cumulative Redeemable Preferred Stock	2,329,584	2,263,799	2,655,607
Potentially dilutive Series J Cumulative Redeemable Preferred Stock	1,858,622	720,803	—
	20,028,886	13,559,863	16,421,253