Equity Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	Nov. 26, 2013		Mar. 25, 2013		May 22, 2012
Equity [Abstract]
Shares Sold	3,000,000		2,300,000		1,780,000
Sale Price	$ 30.00		$ 17.60		$ 9.00
Net Proceeds	$ 84,369	[1]	$ 38,209	[1]	$ 14,889	[1]

[1] Proceeds after deducting underwriting discounts, commissions and expenses (in thousands).