EMPLOYEE BENEFIT PLANS - Fair Value of Company's Pension Plan Assets by Asset Category (Details) - Pension Plans - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 256,903	$ 275,480	$ 281,290
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	108	92
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69,600	71,831
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62,563	71,311
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	121,294	129,414
Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,338	2,832
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	188,766	199,181
Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	108	92
Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63,348	65,890
Level 1 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59,294	68,489
Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	64,698	63,689
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,318	1,021
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66,703	74,537
Level 2 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,252	5,941
Level 2 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,269	2,822
Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,596	65,725
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	586	49
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,434	1,762
Level 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,434	$ 1,762