Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share (Narrative) (Details)

v3.8.0.1
Net Loss Per Share (Narrative) (Details) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 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
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
Shares not included in the computation of diluted earnings per share 1,332,272 903,148
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 309,819 190,812