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Stock Based Compensation (Details) - Stock option activity - Employee Stock Option [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2014
Stock Based Compensation (Details) - Stock option activity [Line Items]      
Outstanding at December 31, 2013 1,371,354 1,944,108  
Outstanding at December 31, 2013 $ 5.97 $ 6.06  
Outstanding at December 31, 2013 4 years 255 days 6 years 255 days 5 years 255 days
Options Forfeited, Number of shares (184,798)   (465,786)
Options Forfeited, Weighted-Average Exercise Price $ 4.31   $ 4.76
Options Expired, Number of shares (20,364)   (106,968)
Options Expired, Weighted-Average Exercise Price $ 23.41   $ 12.88
Options outstanding, Number of shares 1,166,192 1,371,354 1,371,354
Options outstanding, Weighted-Average Exercise Price $ 5.93 $ 5.97 $ 5.97
Options outstanding, Weighted-Average Remaining Contractual Term 4 years 255 days 6 years 255 days 5 years 255 days
Options outstanding, Aggregate Intrinsic Value    
Exercisable at December 31, 2015 1,125,988    
Exercisable at December 31, 2015 $ 5.98    
Exercisable at December 31, 2015 4 years 219 days    
Exercisable at December 31, 2015