Stockholders' Equity (Details) (USD $)	0 Months Ended	12 Months Ended
	Jun. 22, 2012	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Issuance of common stock, net of offering costs, shares	5,520,000
Issuance of common stock, net of offering costs	$ 87,700,000	$ 87,700,000
Underwriting Discounts and Commissions	4,600,000
Other Indirect Cost In Connection With Public Offering	$ 127,000