Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital ("APIC") [Member]	Retained earnings [Member]	Accumulated other comprehensive loss [Member]	Non-controlling interest ("NCI") [Member]	Total
Balance at Dec. 31, 2019	$ 194,771	$ 52,110	$ 714,051	$ (59,099)	$ 5,154	$ 906,987
Balance, shares at Dec. 31, 2019	109,337,781
Net income			22,809		20	22,829
Other comprehensive loss				(15,860)	(8)	(15,868)
Comprehensive income			22,809	(15,860)	12	6,961
Stock option exercises	$ 8,684	(1,630)				7,054
Stock option exercises, shares	247,446
Issuance of common stock related to vesting of share units	$ 3,516	(7,445)				(3,929)
Issuance of common stock related to vesting of share units, shares	138,824
Stock option compensation expense		1,187				1,187
Equity-classified share unit expense		1,786				1,786
Equity-classified share units dividend equivalents		139	(139)
Cash dividends paid			(21,905)			(21,905)
Shares repurchased	$ (53,170)					(53,170)
Shares repurchased, shares	(1,525,312)
Balance at Mar. 31, 2020	$ 153,801	46,147	714,816	(74,959)	5,166	844,971
Balance, shares at Mar. 31, 2020	108,198,739
Balance at Dec. 31, 2020	$ 200,451	49,171	791,918	(34,295)	5,154	1,012,399
Balance, shares at Dec. 31, 2020	109,876,428
Net income			28,188		(49)	28,139
Other comprehensive loss				(10,344)	(16)	(10,360)
Comprehensive income			28,188	(10,344)	(65)	17,779
Stock option exercises	$ 8,268	(1,549)				$ 6,719
Stock option exercises, shares	197,863					197,863
Issuance of common stock related to vesting of share units	$ 2,046	(11,347)				$ (9,301)
Issuance of common stock related to vesting of share units, shares	234,275
Issuance (forfeiture) of common stock related to business combination, shares	(55,510)
Share based continuing employment costs related to business combination		2,553				2,553
Stock option compensation expense		1,861				1,861
Equity-classified share unit expense		2,779				2,779
Equity-classified share units dividend equivalents		144	(144)
Cash dividends paid			(24,181)			(24,181)
Balance at Mar. 31, 2021	$ 210,765	$ 43,612	$ 795,781	$ (44,639)	$ 5,089	$ 1,010,608
Balance, shares at Mar. 31, 2021	110,253,056