Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000927003 (http://www.sec.gov/CIK)

Inventory Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Inventory Disclosure [Abstract]
Components of inventories	Our inventories are valued at the lower of cost or market and computed on a first-in, first-out (FIFO) basis. Components of inventories, net of reserves, are as follows:   December 31,   2016   2015 Parts and raw materials $ 43,278   $ 40,578 Work in process 5,292   5,643 Finished goods 7,200   6,352   $ 55,770   $ 52,573