Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Weighted-Average Shares of Common Stock Outstanding used in Calculation of Basic and Diluted Earnings Per Share

	For the three months				For the six months
	ended June 30,				ended June 30,
	2018		2017		2018		2017
Numerator:
Net (loss) income	$	(57,391)	$	9,233	$	(25,846)	$	46,832
Denominator:
Basic weighted-average shares outstanding		115,064		121,455		115,775		121,253
Dilutive impact of stock options and restricted shares		—		982		—		834
Diluted weighted-average shares outstanding		115,064		122,437		115,775		122,087
Net (loss) income per common share:
Basic	$	(0.50)	$	0.08	$	(0.22)	$	0.39
Diluted	$	(0.50)	$	0.08	$	(0.22)	$	0.38