Summary of Significant Accounting Policies (Warranty and After-Sale Costs) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Warranty and After-Sale Costs
Balance at beginning of year	$ 1,593,000		$ 889,000	$ 907,000
Net additions charged to earnings	719,000	[1]	1,592,000	552,000
Costs incurred and adjustments	(1,431,000)		(888,000)	(668,000)
Reserve acquired	0		0	98,000	[2]
Balance at end of year	881,000		1,593,000	889,000
Specific Product Issue			600,000
Cox Flow
Warranty and After-Sale Costs
Reserve acquired				$ 98,000,000

[1] Included in the 2011 increase in the reserve was $0.6 million related to a specific product issue.

[2] The reserve increased $98,000 in 2010 related to the acquisition of Cox Flow Measurement. Refer to Note 3 “Acquisitions” for a description of the acquisition.