Employee Benefit Plans (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2013	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Contributions made to 401(k)		$ 2.4	$ 2.3	$ 2.2
First Tier of Deferral
Defined Contribution Plan Disclosure [Line Items]
Percent of gross pay	100.00%
Percent of eligible deferral	4.00%
Second Tier of Deferral
Defined Contribution Plan Disclosure [Line Items]
Percent of gross pay	50.00%
Percent of eligible deferral	2.00%