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Earnings Per Share Earnings Per Share (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]      
Incremental common shares attributable to dilutive effect of conversion of debt securities 941,000 491,000 276,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 354,000 0 0