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Equity Based Plans (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Employees [Member]
Dec. 31, 2012
Maximum [Member]
Executive Officers [Member]
Dec. 31, 2012
Minimum [Member]
Employees [Member]
Dec. 31, 2012
Minimum [Member]
Executive Officers [Member]
Dec. 31, 2012
Incentive stock option [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2010
Restricted Stock [Member]
Dec. 31, 2012
1992 Plan [Member]
Dec. 31, 2011
1992 Plan [Member]
Dec. 31, 2010
1992 Plan [Member]
Dec. 31, 2012
2003 Plan [Member]
Dec. 31, 2011
2003 Plan [Member]
Dec. 31, 2010
2003 Plan [Member]
Dec. 31, 2012
2003 Plan [Member]
Maximum [Member]
Dec. 31, 2012
2003 Plan [Member]
Restricted Stock [Member]
Dec. 31, 2012
Inducements [Member]
Dec. 31, 2003
Inducements [Member]
Employees
Dec. 31, 2011
Inducements [Member]
Dec. 31, 2010
Inducements [Member]
Equity Based Plans (Textual) [Abstract]                                                  
Number of common shares available for grant                           3,495,000                      
Restricted Stock Issued                     614,300 156,750 84,400 0             253,400   145,000    
Outstanding stock options 75,840 348,810 723,890 874,192                   0 0 15,000 60,000 251,500 541,500     0   80,000 124,000
Exercise period of incentive stock option                   10 years                       10 years      
Non-qualified options to purchase shares         600,000                                        
Granted options to individuals                                             5    
Stock option outstanding                                               124,000  
Number of common shares available for grant                                       1,250,000          
Restrictions on the stock granted lapse in           5 years 4 years 4 years 3 years                                
Shares outstanding for which restrictions had not lapsed 187,170                                                
Compensation expense $ 0 $ 0                 $ 2,102,000 $ 2,032,000 $ 1,245,000                        
Share based compensation expense                     $ 2,800,000                            
Restrictions will lapse in 2013 through 2016