Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions (Details)

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Equity Transactions (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 0 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
May 30, 2013
Series A Preferred Stock
Jun. 30, 2013
Series A Preferred Stock
Jun. 30, 2013
Maximum [Member]
Class of Stock [Line Items]            
Preferred stock issued $ 16   $ 0 $ 75,000    
Preferred stock, dividend rate       10.00%    
Proceeds from issuance of preferred stock 70,090 0   70,000    
Preferred stock, shares issued 1,578,948   0 1,600,000    
Preferred stock, par value $ 0.01   $ 0.01 $ 0.01    
Share price       $ 47.50    
Preferred stock, liquidation preference per share $ 50.00   $ 50.00 $ 50.00    
Preferred stock, dividend rate, per share       $ 5.00    
Preferred stock, dividends paid, per share         $ 0.43056  
Dividends paid         $ 680  
Common stock, shares authorized 60,000,000   60,000,000      
Common stock, capital shares reserved for future issuance 16,800,000         42,200,000