Earnings Per Share - Potentially Dilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Restricted share awards (RSAs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of earnings per share (in shares)	0	104,053	388	309,922
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of earnings per share (in shares)	0	201,878	0	209,071
Convertible subordinated notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of earnings per share (in shares)	0	0	0	1,237,374