CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2018	Jun. 25, 2017
Cash flows from operating activities
Net income	$ 45,510	$ 28,674
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,122	31,284
Stock-based compensation expense	7,145	8,010
Undistributed (gain)/loss of joint ventures	(7)	93
Long-term retirement benefit obligations	(8,435)	(13,279)
Other-net	965	1,737
Changes in operating assets and liabilities:
Accounts receivable-net	46,976	47,802
Other assets	14,430	3,040
Accounts payable, accrued payroll and other liabilities	(65,393)	(20,353)
Unexpired subscriptions	7,356	12,453
Net cash provided by operating activities	77,669	99,461
Cash flows from investing activities
Purchases of marketable securities	(229,534)	(245,033)
Maturities of marketable securities	234,883	277,499
Capital expenditures	(45,529)	(21,411)
Other-net	(1,474)	36
Net cash (used in)/provided by investing activities	(41,654)	11,091
Long-term obligations:
Repayment of debt and capital lease obligations	(276)	(276)
Dividends paid	(13,128)	(12,969)
Capital shares:
Proceeds from stock option exercises	40,527	2,706
Share-based compensation tax withholding	(8,956)	(3,803)
Net cash provided by/(used in) financing activities	18,167	(14,342)
Net increase in cash, cash equivalents and restricted cash	54,182	96,210
Effect of exchange rate changes on cash	(473)	268
Cash, cash equivalents and restricted cash at the beginning of the period	200,936	125,550
Cash, cash equivalents and restricted cash at the end of the period	$ 254,645	$ 222,028