Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
GOODWILL AND OTHER INTANGIBLE ASSETS
Definite-lived, Gross Carrying Amount	$ 30,623		$ 30,623		$ 26,145
Definite-lived, Accumulated Amortization	(13,989)		(13,989)		(11,831)
Definite-lived, Net Carrying Amount	16,634		16,634		14,314
Total other intangible assets, Gross Carrying Amount	39,693		39,693		35,215
Total other intangible assets, Accumulated Amortization	(13,989)		(13,989)		(11,831)
Accumulated Impairment	(4,953)		(4,953)		(4,953)
Total other intangible assets, Net Carrying Amount	20,751		20,751		18,431
Amortization expense	1,200	$ 1,600	2,200	$ 3,000
Trade Name
GOODWILL AND OTHER INTANGIBLE ASSETS
Indefinite lived, Gross Carrying Amount	9,070		9,070		9,070
Indefinite lived, Accumulated Impairment	(4,953)		(4,953)		(4,953)
Indefinite lived, Net Carrying Amount	4,117		4,117		4,117
Customer Lists
GOODWILL AND OTHER INTANGIBLE ASSETS
Definite-lived, Gross Carrying Amount	21,374		21,374		16,879
Definite-lived, Accumulated Amortization	(7,664)		(7,664)		(5,845)
Definite-lived, Net Carrying Amount	13,710		13,710		11,034
Trade Name
GOODWILL AND OTHER INTANGIBLE ASSETS
Definite-lived, Gross Carrying Amount	255		255		255
Definite-lived, Accumulated Amortization	(189)		(189)		(176)
Definite-lived, Net Carrying Amount	66		66		79
Patents and Other Intangibles
GOODWILL AND OTHER INTANGIBLE ASSETS
Definite-lived, Gross Carrying Amount	8,994		8,994		9,011
Definite-lived, Accumulated Amortization	(6,136)		(6,136)		(5,810)
Definite-lived, Net Carrying Amount	$ 2,858		$ 2,858		$ 3,201