Employee Benefits Plans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Employee Benefits Plans [Abstract]
Deferred retirement benefits liability	$ 4,170

The total amount of the entity's obligation as of the balance sheet date under any other retirement plan(s), such as one or more defined contribution plans.

No definition available.

Name:	us-gaap_OtherPostretirementBenefitsPayableCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant