Intangible Assets and Goodwill - Schedule of intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Intangible assets:
Gross intangible assets	$ 28,239	$ 27,500
Less accumulated amortization	(25,087)	(24,206)
Net intangible assets subject to amortization	3,152	3,294
Intangible assets, net of accumulated amortization	24,486	24,628
Amortization of intangible assets	881	798
Indefinite-lived trademarks and trade name
Intangible assets:
Indefinite‑lived trademarks and trade name	21,334	21,334
Noncompete agreements
Intangible assets:
Noncompete agreements	25,030	24,370
Other intangible assets
Intangible assets:
Other intangible assets	$ 3,209	$ 3,130