Fair Value of Assets and Liabilities - Securities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - mutual funds	$ 8,940	$ 8,677
Derivative contracts, net	5,430	1,013
Assets, fair value	14,370	9,690
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - mutual funds	8,940	8,677
Derivative contracts, net	0	0
Assets, fair value	8,940	8,677
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - mutual funds	0	0
Derivative contracts, net	5,430	1,013
Assets, fair value	5,430	1,013
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - mutual funds	0	0
Derivative contracts, net	0	0
Assets, fair value	$ 0	$ 0