Significant Changes Due To Topic 606 (Summary of the Effects of Adoption of ASC Topic 606 on the Company's Prior Year Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventories	$ 14,862	$ 13,708
Contract assets	4,766	2,979
Other accrued liabilities	4,286	3,739
Accumulated deficit	$ (5,287)	(6,056)
Accounting Standards Update 2014-09 [Member]
Inventories		13,708
Contract assets		2,979
Other accrued liabilities		3,739
Accumulated deficit		(6,056)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Inventories		(1,689)
Contract assets		2,979
Other accrued liabilities		515
Accumulated deficit		775
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Inventories		15,397
Other accrued liabilities		3,224
Accumulated deficit		$ (6,831)