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Subsequent Events - Common Stock Offering (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 12, 2013
Common Stock [Member]
May 03, 2012
Common Stock [Member]
Jan. 28, 2014
Subsequent Event [Member]
Common Stock [Member]
Subsequent Event [Line Items]            
Stock issued           8,250,000
Underwriter over-allotment           1,237,500
Share price           $ 21.50
Proceeds from issuance of common stock $ 202,542 $ 190,798 $ 111,008 $ 189,900 $ 190,800 $ 195,800