Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Common stock	Treasury shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning balance (in shares) at Dec. 31, 2016		59,320,214
Beginning balance at Dec. 31, 2016	$ 54,687	$ 83,770	$ (3,773)	$ 139,399	$ (146,761)	$ (17,948)
Increase (Decrease) in Stockholders' Equity
Net income	64,860				64,860
Other comprehensive income (loss), net of tax	12,628					12,628
Distributions from additional paid-in capital $0.77 per share as of December 31 ,2017 and $0.80 per share as of December 31, 2018	(45,705)			(45,705)
Share based compensation	8,835			8,835
Ending balance (in shares) at Dec. 31, 2017		59,320,214
Ending balance at Dec. 31, 2017	95,305	$ 83,770	(3,773)	102,529	(81,901)	(5,320)
Increase (Decrease) in Stockholders' Equity
Net income	121,310				121,310
Other comprehensive income (loss), net of tax	(14,308)					(14,308)
Distributions from additional paid-in capital $0.77 per share as of December 31 ,2017 and $0.80 per share as of December 31, 2018	(47,665)			(47,665)
Share buyback (in shares)		(206,501)
Share buyback	(4,926)		(4,926)
Share based compensation	8,680			8,680
Issuance of stock under equity compensation plans (in shares)		404,785
Issuance of stock under equity compensation plans	$ 500	$ 484	16
Ending balance (in shares) at Dec. 31, 2018	59,518,498	59,518,498
Ending balance at Dec. 31, 2018	$ 158,896	$ 84,254	(8,683)	63,544	39,409	(19,628)
Increase (Decrease) in Stockholders' Equity
Net income	86,920				86,920
Other comprehensive income (loss), net of tax	(14,734)					(14,734)
Distributions from additional paid-in capital $0.77 per share as of December 31 ,2017 and $0.80 per share as of December 31, 2018				48,000
Dividends paid - $0.80 per share	(48,033)				(48,033)
Share based compensation	2,018			2,018
Issuance of stock under equity compensation plans (in shares)		705,649
Issuance of stock under equity compensation plans	$ 946	$ 778	168
Ending balance (in shares) at Dec. 31, 2019	60,224,147	60,224,147
Ending balance at Dec. 31, 2019	$ 186,013	$ 85,032	$ (8,515)	$ 65,562	$ 78,296	$ (34,362)