Annual report pursuant to Section 13 and 15(d)

Equity Offerings (Details)

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Equity Offerings (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Mar. 31, 2011
Mar. 14, 2011
Dec. 31, 2012
Dec. 31, 2011
Proceeds received from issuance of shares        
Original issuance, shares 27,000,000 27,000,000 27,000,000  
Original issuance     $ 101,250 $ (104,828)
Over-allotment, shares     2,397,029  
Over-allotment     8,989  
Total shares     29,397,029  
Total     110,239  
Underwriters discount and commissions, shares     5.5% on 24,064,029 shares  
Underwriters discount and commissions     (4,963)  
Offering expenses     (448)  
Net proceeds     $ 104,828 $ 104,828