CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Other Comprehensive (Loss) Income	Other Comprehensive (Loss) Income Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2018		42,907,326
Beginning balance at Dec. 31, 2018	$ 366,349	$ 13	$ 332,330	$ 34,187	$ (172)	$ (181)	$ 172
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	829		829
Vesting of restricted stock units (in shares)		93,014
Tax withholding payment related to net share settlement of equity awards (in shares)		(13,657)
Tax withholding payment related to net share settlement of equity awards	(130)		(130)
Other comprehensive (loss) income	(2,098)					(2,098)
Net income	3,482			3,482
Ending balance (in shares) at Mar. 31, 2019		42,986,683
Ending balance at Mar. 31, 2019	368,432	$ 13	333,029	37,497		(2,107)
Beginning balance (in shares) at Dec. 31, 2018		42,907,326
Beginning balance at Dec. 31, 2018	366,349	$ 13	332,330	34,187	$ (172)	(181)	$ 172
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,857
Ending balance (in shares) at Sep. 30, 2019		42,989,840
Ending balance at Sep. 30, 2019	395,822	$ 13	335,237	64,872		(4,300)
Beginning balance (in shares) at Mar. 31, 2019		42,986,683
Beginning balance at Mar. 31, 2019	368,432	$ 13	333,029	37,497		(2,107)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,110		1,110
Vesting of restricted stock units (in shares)		2,149
Tax withholding payment related to net share settlement of equity awards (in shares)		(722)
Tax withholding payment related to net share settlement of equity awards	(8)		(8)
Other comprehensive (loss) income	(1,553)					(1,553)
Net income	14,677			14,677
Ending balance (in shares) at Jun. 30, 2019		42,988,110
Ending balance at Jun. 30, 2019	382,658	$ 13	334,131	52,174		(3,660)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,117		1,117
Vesting of restricted stock units (in shares)		2,135
Tax withholding payment related to net share settlement of equity awards (in shares)		(405)
Tax withholding payment related to net share settlement of equity awards	(11)		(11)
Other comprehensive (loss) income	(640)					(640)
Net income	12,698			12,698
Ending balance (in shares) at Sep. 30, 2019		42,989,840
Ending balance at Sep. 30, 2019	395,822	$ 13	335,237	64,872		(4,300)
Beginning balance (in shares) at Dec. 31, 2019		42,991,016
Beginning balance at Dec. 31, 2019	408,165	$ 13	336,362	74,254		(2,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,393		1,393
Vesting of restricted stock units (in shares)		237,988
Tax withholding payment related to net share settlement of equity awards (in shares)		(27,948)
Tax withholding payment related to net share settlement of equity awards	(362)		(362)
Other comprehensive (loss) income	(7,542)					(7,542)
Net income	14,376			14,376
Ending balance (in shares) at Mar. 31, 2020		43,201,056
Ending balance at Mar. 31, 2020	416,030	$ 13	337,393	88,630		(10,006)
Beginning balance (in shares) at Dec. 31, 2019		42,991,016
Beginning balance at Dec. 31, 2019	408,165	$ 13	336,362	74,254		(2,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36,034
Ending balance (in shares) at Sep. 30, 2020		43,207,120
Ending balance at Sep. 30, 2020	444,426	$ 13	340,299	110,288		(6,174)
Beginning balance (in shares) at Mar. 31, 2020		43,201,056
Beginning balance at Mar. 31, 2020	416,030	$ 13	337,393	88,630		(10,006)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,435		1,435
Vesting of restricted stock units and exercise of stock options (in shares)		6,456
Tax withholding payment related to net share settlement of equity awards (in shares)		(1,834)
Tax withholding payment related to net share settlement of equity awards	(8)		(8)
Other comprehensive (loss) income	2,108					2,108
Net income	9,857			9,857
Ending balance (in shares) at Jun. 30, 2020		43,205,678
Ending balance at Jun. 30, 2020	429,422	$ 13	338,820	98,487		(7,898)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,491		1,491
Vesting of restricted stock units and exercise of stock options (in shares)		2,197
Tax withholding payment related to net share settlement of equity awards (in shares)		(755)
Tax withholding payment related to net share settlement of equity awards	(12)		(12)
Other comprehensive (loss) income	1,724					1,724
Net income	11,801			11,801
Ending balance (in shares) at Sep. 30, 2020		43,207,120
Ending balance at Sep. 30, 2020	$ 444,426	$ 13	$ 340,299	$ 110,288		$ (6,174)