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Equity - Common Stock Offering Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 28, 2014	Feb. 12, 2013	May 03, 2012	May 18, 2012
Class of Stock [Line Items]
Proceeds from issuance of common stock	$ 197,468	$ 202,542	$ 190,798
Common Stock
Class of Stock [Line Items]
Proceeds from issuance of common stock				$ 195,800	$ 189,900	$ 190,800
Public Offering \| Common Stock
Class of Stock [Line Items]
Shares of stock sold (in shares)				8,250,000	8,000,000		13,225,000
Public offering price (dollars per share)							$ 15.00
Exercise of Over-allotment Option \| Common Stock
Class of Stock [Line Items]
Shares of stock sold (in shares)				1,237,500	1,200,000		1,725,000
Public offering price (dollars per share)				$ 21.50	$ 21.50
Private Placement \| Common Stock
Class of Stock [Line Items]
Shares of stock sold (in shares)							2,000,000