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Stock Plans - Schedule of Activity Related to Restricted Stock (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested shares 0    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, January 1 14,309 17,245 15,425
Granted shares     1,820
Vested shares   2,936  
Nonvested, December 31 14,309 14,309 17,245