Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 27,292	$ 12,059	$ 19,913	$ 6,345	$ 39,351	$ 26,258
Weighted average basic shares outstanding (in shares)	32,605,000		32,321,000		32,596,000	32,300,000
Common stock options and restricted stock (in shares)	255,000		321,000		272,000	330,000
Weighted average shares outstanding, diluted (in shares)	32,860,000		32,642,000		32,868,000	32,630,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	77,000		366,000		47,000	312,000