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Income From Continuing Operations Per Unrestricted Share - Antidilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Options Excluded from Computation of Earnings Per Share, Amount (in shares) 959,900 959,700 1,605,100
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Options Excluded from Computation of Earnings Per Share, Amount (in shares) 959,900 959,700 1,605,100