Annual report pursuant to Section 13 and 15(d)

Business and Summary of Significant Accounting Principles (Redeemable Preferred Stock) (Details)

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Business and Summary of Significant Accounting Principles (Redeemable Preferred Stock) (Details) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Preferred stock, shares authorized 1,000,000 1,000,000 1,000,000
Preferred stock, shares issued 0 0 0
Preferred stock, shares outstanding 0 0 0