ER SHARE

Potentially dilutive securities, including restricted stock, stock options, and performance units, are excluded from the diluted weighted average shares outstanding computation in periods in which they have an anti-dilutive effect, such as when there is a net loss. The treasury-stock method is used to measure the dilutive impact of restricted stock, stock options outstanding, and performance units. The following table shows the shares that have an anti-dilutive effect and are excluded from the diluted weighted average shares outstanding computations:



	Three Months Ended March 31,
	2017	2016
Anti-dilutive shares of restricted common stock	3,398,777	336,330

Anti-dilutive shares of stock options outstanding	1,866,038	235,854

Anti-dilutive shares of performance units	63,025	126,050

The following table sets forth the calculation of basic and diluted loss per share (in thousands, except per share amounts):



	Three Months Ended March 31,
	2017			2016
Net loss	$	(13,678	)	$	(18,427	)

Basic weighted average common shares outstanding	81,992			75,757
Add: Dilutive effect of restricted stock	—			—
Add: Dilutive effect of performance units	—			—
Diluted weighted average common shares outstanding	81,992			75,757

Loss per share:
Basic	$	(0.17	)	$	(0.24	)
Diluted	$	(0.17	)	$	(0.24	)

In March 2017, we issued 50.1 million shares of common stock in an underwritten public offering for net proceeds of $57.5 million. All of the shares issued were newly issued shares.

The net proceeds from the issuance have been or will be used to partially repay indebtedness and for general corporate purposes.