Recent Accounting Standards (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 649,610	$ 610,103
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption	90,000
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption	$ 23,100