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
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 1,150,107 888,042 1,178,607 888,042
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 309,819 187,958 309,819 187,958