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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended
Nov. 10, 2010
Item
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2011
Stockholders' Equity          
Number of shares of common stock issued in equity offering   4,955,000      
Net proceeds from issue of shares of common stock in equity offering   $ 19,966   $ 19,966  
Stockholder Rights Plan          
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock 1        
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase 0.001        
Par value per share of Series AA preferred stock (in dollars per share) $ 0.01   $ 0.01   $ 0.01
Exercise price (in dollars per one-thousandth of a share) $ 48.00        
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable 15.00%        
Minimum percentage of the company's common stock that must receive a tender offer from a third party upon which the rights become exercisable 15.00%        
Beneficial ownership threshold for a holder of grandfathered stock (as a percent) 20.00%        
Beneficial ownership threshold for a holder of grandfathered stock after amendment (as a percent)     15.00%    
Stock Repurchases          
Total repurchase of common stock under the program authorized     $ 828