CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Cash flows from operating activities
Net income	$ 30,156	$ 21,914
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,918	15,041
Stock-based compensation expense	3,827	4,263
Long-term retirement benefit obligations	(5,754)	(3,406)
Other-net	(8,903)	2,565
Changes in operating assets and liabilities:
Accounts receivable-net	42,409	33,469
Other assets	(4,329)	888
Accounts payable, accrued payroll and other liabilities	(55,835)	(67,142)
Unexpired subscriptions	8,695	10,307
Net cash provided by operating activities	25,184	17,899
Cash flows from investing activities
Purchases of marketable securities	(112,029)	(110,346)
Maturities of marketable securities	108,792	122,936
Proceeds from/(purchase of) investments – net	41	(484)
Capital expenditures	(10,473)	(24,882)
Other-net	689	635
Net cash used in investing activities	(12,980)	(12,141)
Long-term obligations:
Repayment of debt and finance lease obligations	(138)	(138)
Dividends paid	(6,601)	(6,530)
Capital shares:
Proceeds from stock option exercises	2,965	40,439
Share-based compensation tax withholding	(15,376)	(8,747)
Net cash (used in)/provided by financing activities	(19,150)	25,024
Net (decrease)/increase in cash, cash equivalents and restricted cash	(6,946)	30,782
Effect of exchange rate changes on cash	(338)	195
Cash, cash equivalents and restricted cash at the beginning of the period	259,799	200,936
Cash, cash equivalents and restricted cash at the end of the period	$ 252,515	$ 231,913