Equity and Noncontrolling Interest - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Numerator:
Income from continuing operations, net of income taxes	$ 53,268	$ 46,963
Loss from discontinued operations, net of income taxes	(23)	(4)
Less: Net income attributable to noncontrolling interests	614	181
Net income attributable to common shareholders	$ 52,631	$ 46,778
Denominator:
Weighted-average shares outstanding—Basic (in shares)	47,785	47,546
Effect of dilutive securities:
Stock options, restricted stock units, performance share units and restricted stock (in shares)	1,043	875
Weighted-average shares outstanding—Diluted (in shares)	48,828	48,421