Basis of Presentation (Details) (Reclassification, USD $)	3 Months Ended
Mar. 31, 2012
Reclassification
Basis of Presentation
Increased net cash provided by operating activities due to reclassification of cash and accounts payable	$ 581,000

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration