Pension Plan - Contributions (Details) - USD ($)	3 Months Ended	12 Months Ended
	Apr. 01, 2016	Dec. 31, 2015
Qualified Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Contributions paid-to-date	$ 10,000,000	$ 10,000,000
Defined Benefit Plan, Expected Contributions	0
Supplemental Employee Retirement Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Contributions paid-to-date	100,000	$ 500,000
SERP, Expected contributions	$ 400,000