CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016
Cash flows from operating activities
Net income/(loss)	$ 28,674	$ (14,078)
Adjustments to reconcile net income to net cash provided by operating activities:
Restructuring charge	0	11,855
Multiemployer pension plan charges	0	11,701
Depreciation and amortization	31,284	30,619
Stock-based compensation expense	8,010	5,872
Undistributed loss of joint ventures	93	42,308
Long-term retirement benefit obligations	(13,279)	(14,738)
Uncertain tax positions	160	121
Other-net	1,577	5,809
Changes in operating assets and liabilities:
Accounts receivable-net	47,802	57,223
Other current assets	3,040	(19,934)
Accounts payable, accrued payroll and other liabilities	(20,353)	(78,595)
Unexpired subscriptions	12,453	2,628
Net cash provided by operating activities	99,461	40,791
Cash flows from investing activities
Purchases of marketable securities	(245,033)	(34,912)
Maturities of marketable securities	277,499	316,515
Cash distribution from corporate-owned life insurance	0	38,000
Business acquisitions	0	(12,250)
Purchase of investments – net of proceeds	(163)	(1,350)
Change in restricted cash	7,014	521
Capital expenditures	(21,411)	(14,592)
Other-net	199	(380)
Net cash provided by investing activities	18,105	291,552
Cash flows from financing activities
Repayment of debt and capital lease obligations	(276)	(322)
Dividends paid	(12,969)	(12,937)
Stock issuances	2,706	93
Repurchases	0	(15,684)
Share-based compensation tax withholding	(3,803)	(9,287)
Net cash used in financing activities	(14,342)	(38,137)
Net increase in cash and cash equivalents	103,224	294,206
Effect of exchange rate changes on cash	226	80
Cash and cash equivalents at the beginning of the period	100,692	105,776
Cash and cash equivalents at the end of the period	$ 204,142	$ 400,062