Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 10,450	$ 4,856	$ 6,412	$ 9,949	$ 13,293	$ 9,269	$ 9,745	$ 8,211	$ 31,667	$ 40,518	$ 123,385
Basic weighted-average common shares outstanding (in shares)									38,988	38,233	37,276
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Diluted weighted-average common shares outstanding (in shares)									40,113	39,501	38,892
Basic income per common share (in dollars per share)	$ 0.27	$ 0.12	$ 0.16	$ 0.26	$ 0.35	$ 0.24	$ 0.25	$ 0.22	$ 0.81	$ 1.06	$ 3.31
Diluted income per common share (in dollars per share)	$ 0.26	$ 0.12	$ 0.16	$ 0.25	$ 0.34	$ 0.24	$ 0.25	$ 0.21	$ 0.79	$ 1.03	$ 3.17
Antidilutive securities excluded from diluted net income per common share (in shares)									50	424	604
Effect of dilutive stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of dilutive share-based payments (in shares)									75	61	288
Effect of dilutive restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of dilutive share-based payments (in shares)									1,050	1,207	1,328