Earnings per share of QTS Realty Trust, Inc.

12 Months Ended

Dec. 31, 2019

Earnings per Share [Abstract]

Earnings per Share

16. Earnings per share of QTS Realty Trust, Inc.

Basic income per share is calculated by dividing the net income attributable to common shares by the weighted average number of common shares outstanding during the period. Diluted income per share adjusts basic income per share for the effects of potentially dilutive common shares. Unvested restricted stock awards and our forward sale contracts described in Note 12 contain non-forfeitable rights to dividends and thus are participating securities and are included in the computation of basic earnings per share pursuant to the two-class method for all periods presented. The two-class method is an earnings allocation formula that treats a participating security as having rights to undistributed earnings that would otherwise have been available to common stockholders. Accordingly, service-based restricted stock awards and the forward sale contracts were included in the calculation of basic earnings per share using the two-class method for all periods presented to the extent outstanding during the period.

The computation of basic and diluted net income per share is as follows (in thousands, except per share data):

	Year Ended
	December 31,
	2019		2018		2017
Numerator:
Net income (loss)	$	31,665	$	(7,175)	$	1,457
Loss (income) attributable to noncontrolling interests		(374)		2,715		(175)
Preferred stock dividends		(28,180)		(16,666)		—
Earnings attributable to participating securities		(7,828)		(947)		(593)
Net income (loss) available to common stockholders after allocation of participating securities	$	(4,717)	$	(22,073)	$	689
Denominator:
Weighted average shares outstanding - basic		54,837		50,433		48,381
Effect of Class A partnership units		—		—		6,696
Effect of Class O units, TSR units and options to purchase Class A common stock on an "as if" converted basis		—		—		779
Weighted average shares outstanding - diluted		54,837		50,433		55,856
Basic net income (loss) per share	$	(0.09)	$	(0.44)	$	0.01
Diluted net income (loss) per share	$	(0.09)	$	(0.44)	$	0.01

* Note: The calculations of basic and diluted net income (loss) per share above do not include the following number of Class A partnership units, Class O units, TSR units and options to purchase common stock on an "as if" converted basis, and the effects of Series B Convertible preferred stock on an “as if” converted basis as their respective inclusions would have been antidilutive:

	Year Ended
	December 31,
	2019		2018		2017
Class A Partnership units		6,671		6,653		—
Class O units, TSR units and options to purchase common stock on an "as if" converted basis		518		350		—
Series B Convertible preferred stock on an "as if" converted basis		6,729		3,484		—