Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Net restructuring costs incurred			$ 800
Loss on impairment			7,603
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 671
Charges	337	$ 704		$ 600
Cash payments	(517)	(33)
Other	(223)
Balance at end of period	268	671	268
Arlington Fulfillment Center [Member]
Restructuring Cost and Reserve [Line Items]
Loss on impairment	200	7,400	7,600
Employee-Related Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	600
Charges		600	400	200
Cash payments	(257)
Other	(223)
Balance at end of period	120	600	120
Asset-related Charges
Restructuring Reserve [Roll Forward]
Balance at beginning of period	71
Charges	337	104	400	$ 400
Cash payments	(260)	(33)
Balance at end of period	$ 148	$ 71	$ 148