Employee Benefit Plans - Textual (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Target Allocation		100.00%
Estimate of net actuarial losses reclassified from AOCI in the next fiscal year		$ 555	$ (1,336)
Other comprehensive loss, before reclassifications, net of tax		(6,119)	(1,206)
Current employer pension plan contributions		1,228	$ 1,920
Scenario, Forecast [Member] | Reclassification out of Accumulated Other Comprehensive Income [Domain]
Defined Benefit Plan Disclosure [Line Items]
Estimate of net actuarial losses reclassified from AOCI in the next fiscal year	$ 266
Other comprehensive loss, before reclassifications, net of tax	$ 266
Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Current employer pension plan contributions		1,228
Expected pension plan contribution		$ 1,156