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Stockholder's Equity (Details Textual) (USD $)
 9 Months Ended 1 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
May 04, 2012
Jan. 13, 2012
Dec. 31, 2011
Jul. 19, 2012
Series A Preferred Stock [Member]
Sep. 30, 2012
Series A Preferred Stock [Member]
Sep. 30, 2012
Long-Term Incentive Plan [Member]
Sep. 30, 2011
Long-Term Incentive Plan [Member]
Sep. 30, 2012
Long-Term Incentive Plan [Member]
Sep. 30, 2011
Long-Term Incentive Plan [Member]
Dec. 31, 2011
Long-Term Incentive Plan [Member]
Sep. 30, 2012
Period 1 [Member]
Sep. 30, 2012
Period 2 [Member]
Sep. 30, 2012
Period 3 [Member]
Sep. 30, 2012
Two Thousand Ten Equity Incentive Plan [Member]
Feb. 28, 2010
Initial public offering [Member]
Feb. 13, 2012
Additional shares [Member]
Sep. 30, 2012
Restricted stock Activity [Member]
Sep. 30, 2011
Restricted stock Activity [Member]
Sep. 30, 2012
Restricted stock Activity [Member]
Sep. 30, 2011
Restricted stock Activity [Member]
Dec. 31, 2011
Restricted stock Activity [Member]
Sep. 30, 2012
Maximum [Member]
Feb. 28, 2010
Minimum [Member]
Sep. 30, 2012
Minimum [Member]
Stockholders' Equity (Textual) [Abstract]                                                  
Authorized capital stock 400,000,000     400,000,000                           455,000   455,000          
Per share value of restricted stock awards                               $ 20.00       $ 14.20     $ 20.00 $ 14.20  
Grant date fair value per share of restricted stock awards                                             Sep. 30, 2012   Feb. 16, 2010
Fair value of the restricted stock granted                                       $ 700,000          
Shares offered in public offering 1,840,000        1,840,000                                        
Type of preferred stock completed public offering         7.75% Series A Cumulative Redeemable Preferred Stock                                        
Preferred stock dividend rate         7.75%                                        
Number of shares sold upon the exercise of options         240,000                                        
Preferred offering of its preferred stock price per share $ 0.01     $ 0.01 $ 25.00                                        
Estimated net proceeds of the offering 44,551,000       44,300,000                                        
Other estimated offering expenses of approximately         300,000                                        
Number of performance measurement periods for the LTIP awards three                                                
Performance measurement periods for the LTIP awards, initial date                       Feb. 16, 2010 Jan. 01, 2011 Jan. 01, 2012                      
Public follow-on offering of common stock shares 13,434,889   4,000,000 9,308,670                         61,853                
Performance measurement periods for the LTIP awards, end date                       Dec. 31, 2012 Dec. 31, 2013 Dec. 31, 2014                      
Underwriting Discount         1,400,000                                        
Series A Preferred Stock redemption period           5 years                                      
Redemption Date of Series A Preferred Stock           Jul. 19, 2017                                      
Redemption Price of Series A Preferred Stock           $ 25.00                                      
Fair value of unrestricted common stock per share                             $ 14.01                    
Compensation costs 300,000           121,000 22,000 162,000 189,000 0             200,000 200,000 600,000 400,000        
Offering price per share of common stock     $ 14.25                           $ 14.25                
Stockholders' Equity (Additional Textual) [Abstract]                                                  
Authorized capital stock 400,000,000     400,000,000                           455,000   455,000          
Common stock, par value per share $ 0.01     $ 0.01                                          
Shares sold to executive and senior officers and members of the board of directors     93,000                                            
Underwriting discount or commission paid 0                                                
Preferred stock, shares 100,000,000     100,000,000                                          
Preferred stock, par value $ 0.01     $ 0.01 $ 25.00                                        
Issuance of common stock 55,013,000                                                
Common stock, shares outstanding 13,434,889     9,308,670                                          
Net proceeds of the primary follow-on offering 54,700,000                                                
Shares of unrestricted common stock granted   21,416                                              
Underwriting discount and offering costs 3,100,000                                                
Net proceeds to repay outstanding borrowings under the Facility     41,000,000                                            
Non-vested restricted stock awards 149,995                                 149,995   149,995   133,526      
Common stock authorized for issuance as restricted stock grants, remaining 186,810                                                
Vesting period for the restricted stock 5 years                                                
Remaining weighted average period 3 years 1 month 6 days                                                
Total unrecognized compensation costs related to restricted stock issuances $ 2,200,000