Summary of Significant Accounting Policies (Details 1) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Level 1 [Member]
Fair value assets
Mutual funds	$ 13,536	$ 13,960
Equities	7,057	9,336
Total	20,593	23,296
Level 2 [Member]
Fair value assets
Common/collective trust funds	2,192	2,431
Total	$ 2,192	$ 2,431

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

No definition available.

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant