Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended
Jan. 31, 2012	Mar. 31, 2012
Shareholders' Equity [Abstract]
Amount of interests and leases available under land agreement		$ 20.0
Issuance of warrants to purchase common stock	6,983
Warrants exercise price		$ 22.09
Warrants expiration date		Aug. 21, 2017

Expiration date of warrants held.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

Name:	invest_InvestmentWarrantsExpirationDate
Namespace Prefix:	invest_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration