CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Cash flows from operating activities
Net income	$ 6,837	$ 23,832	$ 62,842
Adjustments to reconcile net income to net cash provided by operating activities:
Restructuring charge	0	14,804	0
Pension settlement expense	102,109	21,294	40,329
Multiemployer pension plan charges	0	11,701	9,055
Depreciation and amortization	61,871	61,723	61,597
Stock-based compensation expense	14,809	12,430	10,588
Undistributed (income)/loss of joint ventures	(18,641)	36,273	783
Deferred income taxes	105,174	(13,128)	(10,102)
Long-term retirement benefit obligations	(184,418)	(55,228)	(15,404)
Uncertain tax positions	(4,343)	5,089	1,627
Other – net	2,991	(564)	11,494
Changes in operating assets and liabilities:
Accounts receivable – net	12,470	9,825	5,510
Other current assets	(30,527)	1,599	22,141
Accounts payable, accrued payroll and other liabilities	10,012	(32,276)	(22,833)
Unexpired subscriptions	8,368	6,502	1,448
Net cash provided by operating activities	86,712	103,876	179,075
Cash flows from investing activities
Purchases of marketable securities	(466,522)	(566,846)	(818,865)
Maturities/disposals of marketable securities	548,461	725,365	818,262
Cash distribution from corporate-owned life insurance	0	38,000	0
Business acquisitions	0	(40,410)	0
(Purchases)/proceeds from investments	15,591	(1,955)	(5,068)
Capital expenditures	(84,753)	(30,095)	(26,965)
Change in restricted cash	6,919	3,804	1,521
Other-net	1,323	409	412
Net cash provided by/(used in) investing activities	21,019	128,272	(30,703)
Cash flows from financing activities
Repayment of debt and capital lease obligations	(552)	(189,768)	(223,648)
Dividends paid	(26,004)	(25,897)	(26,599)
Stock issuances	4,601	761	103,026
Repurchases	0	(15,684)	(69,293)
Windfall tax benefit related to share-based payments	0	3,193	2,303
Share-based compensation tax withholding	(4,064)	(9,629)	(3,749)
Net cash used in financing activities	(26,019)	(237,024)	(217,960)
Net increase/(decrease) in cash and cash equivalents	81,712	(4,876)	(69,588)
Effect of exchange rate changes on cash and cash equivalents	507	(208)	(1,243)
Cash and cash equivalents at the beginning of the year	100,692	105,776	176,607
Cash and cash equivalents at the end of the year	182,911	100,692	105,776
Cash payments
Interest, net of capitalized interest	28	39,487	41,449
Income tax payments – net	$ 22	$ 44,896	$ 21,078