Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share (Narrative) (Details)

v3.10.0.1
Net Loss Per Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                
Dilutive effect of outstanding stock options and shares associated with long-term incentive compensation plans 0   0       0 0
Stock Compensation Plan [Member]                
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                
Dilutive effect of outstanding stock options and shares associated with long-term incentive compensation plans   0   0 0 0    
Shares not included in the computation of diluted earnings per share 1,144,607   1,145,417       1,351,772 1,145,417
Performance Units [Member]                
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                
Shares not included in the computation of diluted earnings per share 309,819   181,224       309,819 181,224