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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2016		11,420
Beginning balance at Dec. 31, 2016	$ 387,717	$ 1,146	$ 99,765	$ (426)	$ 334,988	$ (47,756)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	61,905				44,315	17,590
Stock-based compensation expense	1,869		1,869
Stock-based compensation transactions (in shares)		114
Stock-based compensation transactions	2,231	$ 12	2,219
Other	0		11		(11)
Dividends paid	(4,614)				(4,614)
Ending balance (in shares) at Dec. 31, 2017		11,534
Ending balance at Dec. 31, 2017	449,108	$ 1,158	103,864	(426)	374,678	(30,166)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	58,821				73,486	(14,665)
Stock-based compensation expense	2,450		2,450
Stock-based compensation transactions (in shares)		86
Stock-based compensation transactions	2,116	$ 8	2,108
Dividends paid	(5,124)				(5,124)
Ending balance (in shares) at Dec. 31, 2018		11,620
Ending balance at Dec. 31, 2018	507,371	$ 1,166	108,422	(426)	443,040	(44,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	66,899				62,906	3,993
Stock-based compensation expense	3,269		3,269
Stock-based compensation transactions (in shares)		90
Stock-based compensation transactions	1,984	$ 9	1,975
Repurchased shares (in shares)		(40)
Repurchased shares	(4,140)			(4,140)
Dividends paid	(5,626)				(5,626)
Ending balance (in shares) at Dec. 31, 2019		11,670
Ending balance at Dec. 31, 2019	$ 569,757	$ 1,175	$ 113,666	$ (4,566)	$ 500,320	$ (40,838)

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