Commitments and Contingencies 5 (Details) (USD $)	Dec. 31, 2010	Dec. 31, 2009
Lease Commitments And Purchase Agreements [Abstract]
Accrual for legal proceedings and unasserted claims	$ 1,500,000	$ 1,500,000

The carrying amount as of the balance sheet date of the combined total of loss contingency reserves.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant