Quarterly report pursuant to Section 13 or 15(d)

Capital and Accumulated Other Comprehensive Loss - Shares Held for Deferred Compensation Plans (Details)

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Capital and Accumulated Other Comprehensive Loss - Shares Held for Deferred Compensation Plans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Oct. 01, 2016
Equity [Abstract]      
Shares held for deferred compensation plans (in shares) 320,615 439,667 450,067
Cost of shares held for deferred compensation plans $ 3,973 $ 5,464 $ 5,434