Warranty Reserve and Accrual for Loss Contracts Related to Service (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Warranty Reserve.
Beginning balance - January 1	$ 1,311	$ 1,608
Addition for Relion acquisition		233
Additions for current period deliveries	230	961
Reductions for payments made	1,135	1,491
Ending balance - December 31	$ 406	$ 1,311