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Stockholders' Equity (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
ATM Sales Program
Dec. 31, 2011
ATM Sales Program
Dec. 31, 2010
ATM Sales Program
May 06, 2010
ATM Sales Program
Sep. 30, 2009
September 2009 Public Offering
Sep. 30, 2009
September 2009 Public Offering Underwriter Overallotment Option
Equity Offerings                  
Maximum aggregate gross sales price of common stock             $ 75,000,000    
Shares of common stock sold   1,756,000 9,200,000 1,500,000 1,500,000 1,756,700   9,200,000 1,200,000
Average price per share of common stock sold under the Sales Program (in dollars per share)       $ 12.00 $ 12.00 $ 12.92      
Amount payable to the placement/sales agent         360,000 454,000      
Offering related expenses incurred         256,000 469,000      
Price per share of common stock sold (in dollars per share)               $ 13.00  
Proceeds from the issuance of common stock, net $ 18,001,000 $ 22,701,000 $ 119,600,000   $ 17,400,000 $ 21,800,000   $ 114,700,000  
Equity-Based Compensation                  
Maximum number of shares provided for grant under equity-based incentive compensation plan 2,000,000                
Number of shares available for grant under the plan 1,944,428