Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal		$ 16,979	$ 20,405	$ 25,170
State		1,301	2,312	349
Foreign		2,362	738	931
Total, Current		20,642	23,455	26,450
Deferred:
Federal		23,498	10,133	5,474
State		251	(1,023)	(2,682)
Foreign		161	(1,715)	(1,691)
Total, Deferred		23,910	7,395	1,101
Income tax expense		$ 44,552	$ 30,850	$ 27,551
Federal statutory rate	21.00%	35.00%	35.00%	35.00%
Excess tax benefit share based compensation		$ 800	$ 500
Tax adjustments, settlements, and unusual provisions		$ 9,700