Condensed Consolidated Statements of Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at beginning of period at Dec. 31, 2018	$ 377,372	$ (28,270)	$ (10,108)	$ 338,994
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	32,556	0	32,556
Cash dividends declared	0	(12,507)	0	(12,507)
Repurchase of common stock	(26,284)	0	0	(26,284)
Issuance of common stock	282	0	0	282
Share based compensation	1,348	0	0	1,348
Share based compensation withholding obligation	(879)	0	0	(879)
Other comprehensive income	0	0	6,735	6,735
Balances at end of period at Sep. 30, 2019	351,839	(8,221)	(3,373)	340,245
Balance at beginning of period at Jun. 30, 2019	351,894	(16,617)	(4,431)	330,846
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	12,445	0	12,445
Cash dividends declared	0	(4,049)	0	(4,049)
Repurchase of common stock	(502)	0	0	(502)
Issuance of common stock	0	0	0	0
Share based compensation	460	0	0	460
Share based compensation withholding obligation	(13)	0	0	(13)
Other comprehensive income	0	0	1,058	1,058
Balances at end of period at Sep. 30, 2019	351,839	(8,221)	(3,373)	340,245
Balance at beginning of period at Dec. 31, 2019	352,344	1,611	(3,786)	350,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	39,166	0	39,166
Cash dividends declared	0	(13,239)	0	(13,239)
Repurchase of common stock	(13,784)	0	0	(13,784)
Issuance of common stock	11	0	0	11
Share based compensation	1,506	0	0	1,506
Share based compensation withholding obligation	(669)	0	0	(669)
Other comprehensive income	0	0	9,932	9,932
Balances at end of period at Sep. 30, 2020	339,408	27,538	6,146	373,092
Balance at beginning of period at Jun. 30, 2020	338,989	12,338	3,796	355,123
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	19,584	0	19,584
Cash dividends declared	0	(4,384)	0	(4,384)
Repurchase of common stock	0	0	0	0
Issuance of common stock	0	0	0	0
Share based compensation	497	0	0	497
Share based compensation withholding obligation	(78)	0	0	(78)
Other comprehensive income	0	0	2,350	2,350
Balances at end of period at Sep. 30, 2020	$ 339,408	$ 27,538	$ 6,146	$ 373,092