Revenue Recognition Contract Balances with Customers (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Receivables from Customers	$ 37,341	$ 37,341	$ 55,600
Contract with Customer, Asset, Net, Current	18	18	18
Contract with Customer, Asset, Net, Noncurrent	5,179	5,179	4,816
Customer deposits and refunds	342	342	$ 644
Increase (Decrease) in Receivables		(18,259)
Increase (Decrease) in Other Current Assets		0
Increase (Decrease) in Other Noncurrent Assets		363
Increase (Decrease) in Other Current Liabilities		(302)
Contract with Customer, Liability, Revenue Recognized	$ 200	$ 600