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Capital Stock (Details Textual) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2011
Jun. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Dec. 31, 2012
Stockholders Rights Agreement [Member]
Dec. 27, 2012
Stockholders Rights Agreement [Member]
Dec. 31, 2012
June 2010 Authorization [Member]
Common Stock, Shares Authorized (in shares)     75,000,000 75,000,000          
Preferred Stock, Shares Authorized (in shares)     5,000,000 5,000,000     100,000    
Stockholder Rights Exercisable Description             Person becomes an Acquiring Person (unless such Person acquires 50 percent or more of the common stock of the Company then outstanding, as more fully described in the Rights Agreement), the Board of Directors may exchange one share of the Company's common stock for each outstanding Right (other than rights owned by such Person, which would have become void). In addition, if the Company is acquired in a merger or other business combination transaction after a Person becomes an Acquiring Person, all holders of Rights, except the Acquiring Person, may purchase at the Right's then-current exercise price, a number of the acquiring Company's common stock having a market value of twice the exercise price. If the Company receives a "qualifying offer" (which includes certain all-cash fully financed tender offers or exchange offers for all of the Company's outstanding common stock), under certain circumstances, holders of 10 percent of the Company's outstanding common stock (excluding stock held by the offeror and its affiliates and associates) may direct the Board of Directors to call a special meeting of stockholders to consider a resolution exempting such "qualifying offer" from the Rights Agreement.    
Redeemption Rights Per Share Value (in dollars per share)             $ 0.001    
Stockholder Rights Plan Expiration Date     Jan. 13, 2016            
Common Stock, Capital Shares Reserved for Future Issuance     4,010,000            
Equity Method Investment, Ownership Percentage               20.00%  
Purchase of treasury stock (in shares) 2,000,000 2,100,000     494,000 264,000     758,000