Operating Segments and Related Information Narrative Accounts Receivable (Details)	Dec. 31, 2012 customers	Jun. 30, 2012 customers	Mar. 31, 2013 Customer A [Member]	Mar. 31, 2013 Customer C [Member]	Dec. 31, 2012 Customer C [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	1	2
Percentage Of Total Trade Receivables			16.00%	25.00%	24.00%