Summary of Significant Accounting Policies (Warranty and After-Sale Costs) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Warranty and After-Sale Costs
Balance at beginning of year	$ 881,000		$ 1,593,000	$ 889,000
Net additions charged to earnings	1,005,000		719,000	1,592,000	[1]
Costs incurred and adjustments	(1,068,000)		(1,431,000)	(888,000)
Reserve acquired	64,000	[2]	0	0	[1]
Balance at end of year	882,000		881,000	1,593,000
Specific Product Issue				600,000
Aquacue
Warranty and After-Sale Cost
Product Warranty Accrual, Additions from Business Acquisition			$ 64,000

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

[2] The reserve increased $64,000 in 2013 related to the acquisition of Aquacue, Inc. Refer to Note 3 “Acquisitions” for a description of the acquisition.