Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions - Stock Option Activity (Details)

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Capital Transactions - Stock Option Activity (Details) - Stock options - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Number of Shares    
Options outstanding at the beginning of the period (in shares) 1,390,000  
Granted (in shares) 25,000  
Forfeited or canceled (in shares) (78,000)  
Exercised (in shares) (69,000) (9,000)
Options outstanding at the end of the period (in shares) 1,268,000  
Weighted Average Exercise Price Per Share    
Options outstanding at the beginning of the period (in dollars per share) $ 12.20  
Granted (in dollars per share) 9.05  
Forfeited or canceled (in dollars per share) 16.31  
Exercised (in dollars per share) 5.11 $ 11.98
Options outstanding at the end of the period (in dollars per share) $ 12.27