Commitments and Contingencies (Details Textual)	Dec. 31, 2012 Number
Capital Leased Assets, Number of Units	5

The number of units (items of property) under capital lease arrangements.

No definition available.

Name:	us-gaap_CapitalLeasedAssetsNumberOfUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant