Reporting Segments Capital expenditure data by reporting segment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total purchases of property and equipment	$ 7,529	$ 6,225	$ 5,658
GETS [Member]
Segment Reporting Information [Line Items]
Total purchases of property and equipment	4,832	4,082	2,734
PSS [Member]
Segment Reporting Information [Line Items]
Total purchases of property and equipment	670	837	757
MRI [Member]
Segment Reporting Information [Line Items]
Total purchases of property and equipment	29	116	649
Corporate [Member]
Segment Reporting Information [Line Items]
Total purchases of property and equipment	1,998	1,190	1,518
Including L R Kimball and DSPCon Property and Equipment Acquired [Member]
Segment Reporting Information [Line Items]
Total purchases of property and equipment			$ 5,658