Operating Segments and Related Information Narrative Accounts Receivable (Details)	Jun. 30, 2012 customers	Dec. 31, 2011 customers	Sep. 30, 2012 Customer A [Member]	Sep. 30, 2012 Customer B [Member]	Sep. 30, 2012 Customer C [Member]	Dec. 31, 2011 Customer D [Member]	Dec. 31, 2011 Customer E [Member]	Dec. 31, 2011 Customer F [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
The Number Of Customers That Account for 10% or Greater of the Company's Accounts Receivables	3	3
Percentage Of Total Trade Receivables			18.00%	11.00%	11.00%	21.00%	13.00%	11.00%