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Stockholders' Equity (Details 1) - Restricted Performance Units [Member] - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Number of Shares, unvested, Beginning Balance 258,811 296,311
Granted, Number of Shares 136,159 60,050
Vested, Number of Shares (108,484) (80,000)
Forfeited, Number of Shares (6,610) (17,550)
Number of Shares, unvested, Ending Balance 279,876 258,811