Reporting Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Restructuring Charges	$ 0		$ 0	$ 72	$ 0
Revenue	295,732		277,916	856,286	810,745
Gross profit	54,488		52,697	158,048	154,393
Operating profit	8,482		6,946	20,155	17,101
Other income (expense), net	(133)		(57)	(207)	(170)
Assets	405,664			405,664		405,807
Income before income taxes	8,349		6,889	19,948	16,931
CEO Compensation - Net Income		856
CEO Compensation - Operating Charge		668
CEO Compensation - Operating Charge (after Tax)		421
CEO Separation - DTA Write-off		435
GETS [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0		0	419	0
Revenue	88,388		81,495	254,930	239,483
Gross profit	24,391		22,665	69,596	66,944
Operating profit	3,429		2,917	7,200	7,639
Assets	137,232			137,232		130,269
PSS [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0		0	(249)	0
Revenue	192,426		182,002	557,295	527,869
Gross profit	23,141		22,990	67,896	67,133
Operating profit	7,367		6,489	20,379	17,823
Assets	170,764			170,764		168,786
MRI [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0		0	0	0
Revenue	14,918		14,419	44,061	43,393
Gross profit	6,956		7,042	20,556	20,316
Operating profit	1,721		1,987	4,733	5,676
Assets	25,026			25,026		28,098
Corporate [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	0		0	(98)	0
Operating profit	(4,035)		(4,447)	(12,157)	(14,037)
Assets	$ 72,642			$ 72,642		$ 78,654