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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Cash flows relating to operating activities    
Net income $ 53,245 $ 46,959
Loss from discontinued operations, net of income taxes (23) (4)
Income from continuing operations, net of income taxes 53,268 46,963
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities:    
Depreciation and amortization 33,210 32,411
Stock-based compensation 10,541 9,486
Deferred income taxes (782) 26,273
Gain on venture capital investments (6,451) (4,103)
Gain on divestiture 0 (10,577)
Other, net 3,932 594
Changes in assets and liabilities:    
Trade receivables, net (3,780) (21,062)
Inventories (3,501) (2,593)
Accounts payable (1,076) (6,258)
Accrued compensation (30,991) (30,399)
Deferred revenue (18,292) 4,094
Customer contract deposits 23,566 0
Other assets and liabilities, net 407 (10,800)
Net cash provided by operating activities 60,051 34,029
Cash flows relating to investing activities    
Acquisitions of businesses and assets, net of cash acquired (20,216) 0
Capital expenditures (27,726) (15,920)
Purchases of investments and contributions to venture capital investments (5,268) (6,698)
Proceeds from sale of investments 28,596 3,135
Proceeds from divestiture 0 72,462
Other, net (50) 17
Net cash (used in) provided by investing activities (24,664) 52,996
Cash flows relating to financing activities    
Proceeds from long-term debt and revolving credit facility 1,080,299 112,724
Proceeds from exercises of stock options 20,041 19,723
Payments on long-term debt, revolving credit facility, and capital lease obligations (1,096,795) (158,140)
Payments on debt financing costs (4,932) 0
Purchase of treasury stock (13,549) (48,180)
Other, net 0 (451)
Net cash used in financing activities (14,936) (74,324)
Discontinued operations    
Net cash used in operating activities from discontinued operations (636) (473)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 4,254 1,705
Net change in cash, cash equivalents, and restricted cash 24,069 13,933
Cash, cash equivalents, and restricted cash, beginning of period 166,331 119,894
Cash, cash equivalents, and restricted cash, end of period 190,400 133,827
Supplemental cash flow information:    
Cash, cash equivalents, and restricted cash, end of period $ 166,331 $ 119,894