Aquisitions Goodwill Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill	$ 31,685	$ 3,608
Goodwill, Acquired During Period	28,077
Water Activities [Member]
Goodwill [Line Items]
Goodwill	31,685	3,608
Goodwill, Acquired During Period	28,077
Services and Rentals and Real Estate Combine [Member]
Goodwill [Line Items]
Goodwill	0	0
Goodwill, Acquired During Period	$ 0