Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Estimated Useful Lives of Property and Equipment

The estimated useful lives, in years, are shown below:

		Useful Lives
Equipment		1.25-15
Buildings		15-20
Other		3-12

Calculation of Basic and Diluted Net Income (Loss) per Share

The following table presents information necessary to calculate net income (loss) per share for the years ended December 31, 2017, 2016 and 2015, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts):

	2017			2016			2015
BASIC EPS:
Net income (loss)	$	5,910		$	(318,634	)	$	(294,486	)
Adjust for (income) loss attributed to holders of non-vested restricted stock		(170	)		—			3,022
Income (loss) attributed to common stockholders	$	5,740		$	(318,634	)	$	(291,464	)

Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		198,447			146,178			145,416

Basic net income (loss) per common share	$	0.03		$	(2.18	)	$	(2.00	)

DILUTED EPS:
Income (loss) attributed to common stockholders	$	5,740		$	(318,634	)	$	(291,464	)

Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock		198,447			146,178			145,416
Add dilutive effect of potential common shares		1,435			—			—
Weighted average number of diluted common shares outstanding		199,882			146,178			145,416

Diluted net income (loss) per common share	$	0.03		$	(2.18	)	$	(2.00	)

Potentially dilutive securities excluded as anti-dilutive		3,289			9,057			7,781