Accounts Receivable Securitization Program (Details Textual) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Accounts Receivable Securitization Program (Textual) [Abstract]
Maximum purchase limit for receivable interests under Accounts Receivable Securitization Program	$ 125.0
Amount available for accounts receivable securitization program	91.0	91.0
Amount outstanding under accounts receivable securitization program	$ 0	$ 0
Accounts receivable securitization program expiration date	December 2012
Bank financing commitment expiration date	40879
Additional renewal period for bank financing commitment	364 days

This includes both the securitized and unsecuritized portion of the total principal amount.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph i(4)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6942082&loc=d3e107314-111719

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph B11
-Subparagraph b(1)(b), b(6)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_SecuritizedAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant