Income per Unit (Tables)

12 Months Ended

Dec. 31, 2018

Class of Stock [Line Items]

Summary of Basic and Diluted Earnings 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

Schedule of Antidilutive Securities Excluded From Computation of Earnings Per Share

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

Digital Realty Trust, L.P.

Class of Stock [Line Items]

Summary of Basic and Diluted Earnings per Share

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

	Year Ended December 31,
	2018		2017		2016
Net income available to common unitholders	$	260,110	$	176,918	$	337,386
Weighted average units outstanding—basic	214,312,871		178,055,936		152,359,680
Potentially dilutive common units:
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 units outstanding—diluted	214,950,934		178,891,648		153,085,706
Income per unit:
Basic	$	1.21	$	0.99	$	2.21
Diluted	$	1.21	$	0.99	$	2.20

Schedule of Antidilutive Securities Excluded From Computation of Earnings Per Share

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
Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Units	1,876,584	540,773	—
Potentially dilutive Series E Cumulative Redeemable Preferred Units	—	—	2,880,254
Potentially dilutive Series F Cumulative Redeemable Preferred Units	—	463,301	1,939,905
Potentially dilutive Series G Cumulative Redeemable Preferred Units	2,326,861	2,261,153	2,652,503
Potentially dilutive Series H Cumulative Redeemable Preferred Units	3,409,772	3,313,484	3,886,966
Potentially dilutive Series I Cumulative Redeemable Preferred Units	2,329,584	2,263,799	2,655,607
Potentially dilutive Series J Cumulative Redeemable Preferred Units	1,858,622	720,803	—
	11,801,423	9,563,313	14,015,235