Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v2.4.0.6
Subsequent Events (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 0 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Oct. 17, 2012
Issuance of Equity [Member]
Oct. 16, 2012
Issuance of Equity [Member]
Subsequent Event [Line Items]        
Preferred shares issued to the public (in shares) and Common shares issued to the public (in shares) 6,900,000 4,600,000 8,600,000  
Public Offering, Price Per Share       $ 24.75
Public Offering, Proceeds After Underwriter Discounts But Before Offering Expenses $ 165,662 $ 145,361 $ 204,900