Assets Held for Sale - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long Lived Assets Held For Sale [Line Items]
Impairment charges	$ 916	$ 308	$ 544
Net proceeds from sale of building	7,400	2,300	3,100
Other Assets [Member]
Long Lived Assets Held For Sale [Line Items]
Building classified held for sale	1,900	4,400
Level 2 [Member]
Long Lived Assets Held For Sale [Line Items]
Impairment charges	$ 900	$ 300	$ 500