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Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Restructuring Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Loss on impairment	$ 7,448
Restructuring Reserve [Roll Forward]
Charges	704		$ 600
Cash payments	(33)
Balance at end of period	671
Arlington Fulfillment Center [Member]
Restructuring Cost and Reserve [Line Items]
Loss on impairment	7,400
Forecast
Restructuring Reserve [Roll Forward]
Cash payments		$ (1,300)
Employee-Related Costs
Restructuring Reserve [Roll Forward]
Charges	600		200
Balance at end of period	600
Asset-related Charges
Restructuring Reserve [Roll Forward]
Charges	104		$ 400
Cash payments	(33)
Balance at end of period	$ 71