Commitments and Contingencies (Details) (Building Construction-in-Progress [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2013 sqft	Dec. 31, 2012
Building Construction-in-Progress [Member]
Commitments and Contingencies [Line Items]
Property and equipment		$ 4.9
Increase In property, plant and equipment, additions	$ 2.7	$ 1.5
Lease square footage	300,000
Useful Life (in years)	30 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration