Earnings Per Share (Tables)

9 Months Ended

Sep. 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 nine months
	ended September 30,				ended September 30,
	2018		2017		2018		2017
Numerator:
Net income (loss)	$	16,144	$	49,161	$	(9,702)	$	95,994
Denominator:
Basic weighted-average shares outstanding		114,597		119,746		115,378		120,745
Dilutive impact of stock options and restricted shares		1,517		1,280		—		982
Diluted weighted-average shares outstanding		116,114		121,026		115,378		121,727
Net income (loss) per common share:
Basic	$	0.14	$	0.41	$	(0.08)	$	0.80
Diluted	$	0.14	$	0.41	$	(0.08)	$	0.79