Quarterly report pursuant to Section 13 or 15(d)

Mandatorily Redeemable Preferred Stock (Details Textual)

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Mandatorily Redeemable Preferred Stock (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 1 Months Ended 6 Months Ended
Feb. 29, 2012
Jun. 30, 2012
Dec. 31, 2011
Feb. 29, 2012
Mandatorily Redeemable Preferred Stock [Member]
Feb. 29, 2012
Series C Preferred Stock [Member]
Jun. 30, 2012
Series C Preferred Stock [Member]
Class of Stock [Line Items]            
Public offering of preferred stock   2,150,000 2,150,000 1,540,000    
Series C preferred stock         7.125% 7.125%
Preferred Stock, par value   $ 0.001 $ 0.001 $ 0.001    
Public offering price       $ 25.00    
Gross proceeds of the offering totaled       $ 38.5    
Net proceeds, after deducting underwriting discounts and offering expenses       36.7    
Mandatorily Redeemable Preferred Stock (Textual) [Abstract]            
Preferred shares at a redemption price $ 25.00          
Deferred financing fees $ 1.8          
Preferred Stock redemption term On or after January 31, 2016, we may redeem the shares at a redemption price of $25.00 per share, plus any accumulated and unpaid dividends to and including the date of redemption.          
Preferred Stock mandatory redemption date Jan. 31, 2017