Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Water Star, Inc. [Member]	Sep. 30, 2012 Customer Lists and Service Contracts [Member]	Dec. 31, 2011 Customer Lists and Service Contracts [Member]	Sep. 30, 2012 Trade Name [Member]	Dec. 31, 2011 Trade Name [Member]	Sep. 30, 2012 Technology [Member]	Dec. 31, 2011 Technology [Member]
Goodwill Gross [Roll Forward]
Balance, beginning of period			$ 66,523
Foreign currency fluctuations			1,641
Balance, end of period	68,164		68,164
Goodwill Accumulated Impairment Losses [Roll Forward]
Balance, beginning of period			(46,220)
Foreign currency fluctuations			(2,165)
Balance, end of period	(48,385)		(48,385)
Goodwill Net [Roll Forward]
Balance, beginning of period			20,303
Foreign currency fluctuations			(524)
Balance, end of period	19,779		19,779
Acquired Finite-Lived Intangible Assets [Line Items]
Original cost	35,316		35,316		37,706		23,642	25,987	4,559	4,583	7,115	7,136
Accumulated amortization	(13,404)		(13,404)		(13,948)		(9,309)	(10,387)	(1,450)	(1,209)	(2,645)	(2,352)
Carrying amount	21,912		21,912		23,758		14,333	15,600	3,109	3,374	4,470	4,784
Weighted-average original life (in years)						15	15	14	14	14	13	13
Impairment loss on a customer list and technology intangible assets				1,805
Amortization expense on Intangible Assets	663	829	2,095	2,533
Estimated aggregate amortization expense of Intangible Assets [Abstract]
Remaining 2012			575
2013			2,299
2014			2,240
2015			2,228
2016			2,188
Thereafter			12,382
Total			$ 21,912