Common Stock Offering (Details) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	May 01, 2013
Equity [Abstract]
Stock Issued During Period, Shares, New Issues	5,462,500
Sale of Stock, Price Per Share				$ 18.00
Underwriting Fees and Commissions, Per Share				$ 1.08
Net proceeds from stock offering	$ 92,000,000	$ 92,034,000	$ 0
Payments of Stock Issuance Costs	$ 400,000