Revenue from Contracts with Customers Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Customer deposits	$ 6,389,000	$ 8,167,000
Contract Liabilities	5,000,000	11,500,000
Performance obligation satisfied in previous period	29,400,000
Cash payments received from customers	21,100,000
Contract assets	0
Remaining performance obligation	5,500,000
Revenue	125,568,000	$ 106,732,000	$ 114,905,000
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Liabilities	(8,300,000)
Total Products And Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation	$ 5,700,000