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Accounting Policies - Earnings Per Share (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Weighted average number of common shares used for basic EPS (in Shares) 34,713,937 36,554,437 37,651,492
Effect of dilutive stock options and restricted and deferred stock unit awards (in Shares) 496,493 0 0
Weighted average number of common shares and dilutive potential common stock used in dilutive EPS (in Shares) 35,210,430 36,554,437 37,651,492
Stock options and units excluded from diluted EPS calculation (in Shares)   324,804 318,059
Stock Options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of EPS (in Shares) 77,807 164,014 164,014