Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share Reconciliation [Line Items]
Net income	$ 5,915	$ 7,136	$ 6,360	$ 30,356
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period	36,467	37,419	36,565	38,813
Denominator for diluted earnings per share	36,544	37,645	36,821	39,184
Basic earnings per share	$ 0.16	$ 0.19	$ 0.17	$ 0.78
Diluted earnings per share	$ 0.16	$ 0.19	$ 0.17	$ 0.77
Restricted Stock Units [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options	55	146	220	294
Anti-dilutive securities to purchase common shares	1,000	100	500	200
Stock Options [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options	22	80	36	77
Anti-dilutive securities to purchase common shares	100