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Stockholder's Equity (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jul. 19, 2012
May 04, 2012
Jan. 13, 2012
Dec. 31, 2011
Jun. 30, 2012
Long-Term Incentive Plan [Member]
Jun. 30, 2011
Long-Term Incentive Plan [Member]
Jun. 30, 2012
Long-Term Incentive Plan [Member]
Jun. 30, 2011
Long-Term Incentive Plan [Member]
Dec. 31, 2011
Long-Term Incentive Plan [Member]
Jun. 30, 2012
Period 1 [Member]
Jun. 30, 2012
Period 2 [Member]
Jun. 30, 2012
Period 3 [Member]
Feb. 16, 2010
Initial public offering [Member]
Feb. 13, 2012
Additional shares [Member]
Jun. 30, 2012
Restricted stock Activity [Member]
Jun. 30, 2011
Restricted stock Activity [Member]
Jun. 30, 2012
Restricted stock Activity [Member]
Jun. 30, 2011
Restricted stock Activity [Member]
Dec. 31, 2011
Restricted stock Activity [Member]
Jun. 30, 2012
Maximum [Member]
Feb. 16, 2010
Minimum [Member]
Jun. 30, 2012
Minimum [Member]
Stockholders' Equity (Textual) [Abstract]                                                
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                                           Jun. 30, 2012   Feb. 16, 2010
Fair value of the restricted stock granted                                     $ 700,000          
Authorized capital stock 400,000,000 400,000,000       400,000,000                     455,000   455,000          
Public follow-on offering of common stock shares 13,434,889 13,434,889     4,000,000 9,308,670                 8,750,000 61,853                
Offering price per share of common stock         $ 14.25                   $ 20.00 $ 14.25                
Compensation costs 300,000 300,000         110,000 11,000 41,000 167,000 0           200,000 200,000 400,000 400,000        
Number of performance measurement periods for the LTIP awards three three                                            
Performance measurement periods for the LTIP awards, initial date                       Feb. 16, 2010 Jan. 01, 2011 Jan. 01, 2012                    
Performance measurement periods for the LTIP awards, end date                       Dec. 31, 2012 Dec. 31, 2013 Dec. 31, 2014                    
Stockholders' Equity (Additional Textual) [Abstract]                                                
Common stock, par value per share $ 0.01 $ 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       100,000,000                                    
Preferred stock, par value $ 0.01 $ 0.01 $ 25.00     $ 0.01                                    
Issuance of common stock   55,013,000                                            
Common stock, shares outstanding 13,434,889 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                                        
Fair value of unrestricted common stock per share       $ 14.01                                        
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   149,995   133,526      
Preferred stock, shares issued 0 0 1,840,000     0                                    
Preferred stock, shares outstanding 0 0       0                                    
Common stock authorized for issuance as restricted stock grants, remaining 186,810 186,810                                            
Vesting period for the restricted stock   5 years                                            
Remaining weighted average period   3 years 3 months 18 days                                            
Total unrecognized compensation costs related to restricted stock issuances $ 2,400,000 $ 2,400,000