Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	May 31, 2011
Business Acquisition
Business acquisition, effective date of acquisition	May 31, 2011
Business acquisition, cost of acquired entity, purchase price		$ 4,456
Payments to acquire businesses, gross	2,956
Number of installment payments to be paid	2
Amount of installment payments to be paid	750
Water Star, Inc.
Business Acquisition, Purchase Price Allocation
Current Assets		426
Property, Plant and Equipment, net		167
Identified Intangible Assets		3,800
Goodwill		472
Total Assets Acquired		4,865
Current Liabilities		409
Total Liabilities Assumed		409
Net Assets Acquired		$ 4,456