Results of Operations by Business Segment and Geographic Area (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Information (Additional Textual) [Abstract]
Reportable Segments			3
Number of Business Division			2
Number of significant customers			3
Number of Foreign Countries Accounted for More Than Ten Percent Revenue			0
Customer One [Member]
Segment Information (Textual) [Abstract]
Percentage of revenue by two major customers	13.10%	12.80%	14.50%	13.10%
Segment Information (Additional Textual) [Abstract]
Percentage of revenue by two major customers	13.10%	12.80%	14.50%	13.10%
Customer Two [Member]
Segment Information (Textual) [Abstract]
Percentage of revenue by two major customers	10.60%	11.00%	10.80%	11.00%
Segment Information (Additional Textual) [Abstract]
Percentage of revenue by two major customers	10.60%	11.00%	10.80%	11.00%
Customer Three [Member]
Segment Information (Textual) [Abstract]
Percentage of revenue by two major customers	10.60%
Segment Information (Additional Textual) [Abstract]
Percentage of revenue by two major customers	10.60%
Chemicals segment [Member]
Segment Information (Textual) [Abstract]
Percentage of revenue attributable to Chemicals segment	97.00%	97.00%	97.00%	97.00%