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Equity (Narrative) (Details) - $ / shares
1 Months Ended 9 Months Ended
May 31, 2017
Sep. 30, 2017
May 18, 2017
Dec. 31, 2016
Equity [Abstract]        
Increase in the number of shares authorized 600,000      
Common stock, par value   $ 0.001 $ 0.001 $ 0.001
Shares authorized for issuance   1,600,000    
Shares authorized for repurchase   850,000    
Stock repurchased   0