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Series C Cumulative Convertible Redeemable Preferred Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
item
Dec. 31, 2012
Jan. 31, 2009
Series C Cumulative Convertible Redeemable Preferred Stock      
Preferred stock sold (in shares) 4,102,564 4,102,564  
Liquidation preference (in dollars per share) $ 24.375 $ 24.375  
Cumulative convertible redeemable preferred stock conversion price (in dollars per share)     $ 22.23
Cumulative convertible redeemable preferred stock conversion ratio (in shares) 1.096    
Cumulative convertible redeemable preferred stock redemption price (in dollars per share) $ 24.375    
Quarterly dividend on the Series C preferred stock (in dollars per share) $ 0.393    
Common stock dividend threshold per quarter used to determine participating dividend for securities classified as temporary equity (in dollars per share) $ 0.339    
Basis point increase in dividend rate per quarter on securities classified as temporary equity if the entity incurs a financial ratio violation (as a percent) 0.50%    
Number of consecutive quarters that the entity may fail to meet certain financial ratios before a financial ratio violation occurs 4    
Number of board members who can be appointed by temporary equity shareholders if the entity incurs a financial ratio violation 1    
Carrying value of preferred stock $ 100,000 $ 100,000