Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 7,576	$ 15,130
Basic earnings per share - weighted average shares outstanding	30,916	31,662
Employee stock options and restricted stock units - dilutive shares	350	655
Diluted earnings per share - weighted average shares outstanding	31,266	32,317
Basic	$ 0.25	$ 0.48
Diluted	$ 0.24	$ 0.47