Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Intangible Assets
Intangible amortization expense	$ 1,088	$ 1,149	$ 3,386	$ 3,447
Intangible assets subject to amortization, Gross Book Value	65,885		65,885		$ 65,885
Intangible assets subject to amortization, Accumulated Amortization	(43,064)		(43,064)		(39,678)
Intangible assets subject to amortization, Net Book Value	22,821		$ 22,821		26,207
Customer relationships
Intangible Assets
Weighted Average Life			17 years 2 months 12 days
Intangible assets subject to amortization, Gross Book Value	55,454		$ 55,454		55,454
Intangible assets subject to amortization, Accumulated Amortization	(34,600)		(34,600)		(32,141)
Intangible assets subject to amortization, Net Book Value	20,854		$ 20,854		23,313
Technology and software
Intangible Assets
Weighted Average Life			8 years
Intangible assets subject to amortization, Gross Book Value	7,101		$ 7,101		7,101
Intangible assets subject to amortization, Accumulated Amortization	(6,517)		(6,517)		(5,881)
Intangible assets subject to amortization, Net Book Value	584		$ 584		1,220
Trademarks
Intangible Assets
Weighted Average Life			8 years 8 months 12 days
Intangible assets subject to amortization, Gross Book Value	3,330		$ 3,330		3,330
Intangible assets subject to amortization, Accumulated Amortization	(1,947)		(1,947)		(1,656)
Intangible assets subject to amortization, Net Book Value	$ 1,383		$ 1,383		$ 1,674