Commitments and Contingencies (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2012 LinearFeet	Mar. 08, 2012 Case
Commitments and Contingencies (Additional Textual) [Abstract]
Installation of a reactive iron wall covering area	250
Estimated plan cost for initial construction	$ 688,000
Expected operation and maintenance expenses	$ 1,997,000
Estimated Period	30 years
Unresolved cases		38
Massachusetts [Member]
Commitments and Contingencies (Textual) [Abstract]
Number of cases pending	191
Number of cases terminated	120
Settlement agreements, cases	33
Washington [Member]
Commitments and Contingencies (Textual) [Abstract]
Number of cases pending	1