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Stockholders' Equity (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2013
item
Dec. 31, 2011
Dec. 31, 2011
ATM Sales Program
Dec. 31, 2013
ATM Sales Program
May 06, 2010
ATM Sales Program
May 15, 2013
May 2013 Public Offering
May 15, 2013
May 2013 Public Offering Underwriter Overallotment Option
Equity Offerings              
Maximum aggregate gross sales price of common stock       $ 34,300,000 $ 75,000,000    
Shares of common stock sold     1,500,000     17,250,000 2,250,000
Average price per share of common stock sold under the Sales Program (in dollars per share)     $ 12.00        
Amount payable to the placement/sales agent     360,000        
Offering related expenses incurred 10,818,000 706,000 256,000     10,800,000  
Price per share of common stock sold (in dollars per share)           $ 14.00  
Proceeds from the issuance of common stock, net $ 241,500,000 $ 18,001,000 $ 17,400,000     $ 230,700,000  
Equity-Based Compensation              
Maximum number of shares provided for grant under equity-based incentive compensation plan 2,000,000            
Number of vesting requirements 0            
Number of shares available for grant under the plan 1,944,428