Annual report pursuant to Section 13 and 15(d)

Stock Plans and Management Compensation (Details 2)

v3.8.0.1
Stock Plans and Management Compensation (Details 2) - Stock Options and SAR's [Member]
shares in Thousands
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Period for Stock Options and SARs to be Exercisable (in years) 10 years
Awards Vesting Period (in years) 4 years
Age of Grantee 62 years
$3.37 to $5.86 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit (in dollars per share) $ 3.37
Exercise Price Range, Upper Range Limit (in dollars per share) $ 5.86
Number of Outstanding Options (in shares) | shares 130
Outstanding Options, Weighted Average Remaining Years of Contractual Life (in years) 1 year 3 months 18 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share) $ 5.42
Number of Options Exercisable (in shares) | shares 130
Exercisable Options, Weighted Average Remaining Years of Contractual Life (in years) 1 year 3 months 18 days
Exercisable Options, Weighted Average Exercise Price (in dollars per share) $ 5.42
$5.87 to $17.06 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit (in dollars per share) 5.87
Exercise Price Range, Upper Range Limit (in dollars per share) $ 17.06
Number of Outstanding Options (in shares) | shares 244
Outstanding Options, Weighted Average Remaining Years of Contractual Life (in years) 2 years
Outstanding Options, Weighted Average Exercise Price (in dollars per share) $ 11.99
Number of Options Exercisable (in shares) | shares 244
Exercisable Options, Weighted Average Remaining Years of Contractual Life (in years) 2 years
Exercisable Options, Weighted Average Exercise Price (in dollars per share) $ 11.99
$17.07 to $23.79 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit (in dollars per share) 17.07
Exercise Price Range, Upper Range Limit (in dollars per share) $ 23.79
Number of Outstanding Options (in shares) | shares 220
Outstanding Options, Weighted Average Remaining Years of Contractual Life (in years) 3 years 3 months 18 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share) $ 22.36
Number of Options Exercisable (in shares) | shares 220
Exercisable Options, Weighted Average Remaining Years of Contractual Life (in years) 3 years 3 months 18 days
Exercisable Options, Weighted Average Exercise Price (in dollars per share) $ 22.36