CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Operating activities:
Net income	$ 179,842	$ 100,409
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	32,594	38,331
Amortization of deferred financing costs and debt discount	6,330	4,292
Impairment of intangible and long-lived assets	3	670
Write-off of net assets due to cessation of Spain operations	0	70
Share-based compensation expense	15,346	9,372
Deferred tax provision	1,322	6,393
Allowance for doubtful accounts	(68)	(775)
Reserve for inventory obsolescence	6,146	6,280
Foreign currency exchange rate loss	1,480	158
Gain on early extinguishment of debt	0	(1,840)
Changes in cash due to:
Receivables	(12,763)	6,768
Inventories	11,888	4,821
Prepaid expenses	2,535	9,711
Accounts payable	(2,024)	(19,622)
Accrued liabilities	16,634	(21,459)
Deferred revenue	(12,465)	16,692
Other long term assets and liabilities, net	(12,819)	5,907
Income taxes	20,658	18,627
Cash provided by operating activities	254,639	184,805
Investing activities:
Capital expenditures	(11,932)	(10,755)
Capitalized software expenditures	(20,115)	(20,242)
Cash paid for acquisitions	(3,063)	0
Other items, net	(9,843)	(130)
Cash used for investing activities	(44,953)	(31,127)
Financing activities:
Net borrowings (payments) on revolver	(25,000)	0
Payments on long-term debt	(57,750)	(88,387)
Taxes paid related to net share settlement of equity awards	(20,564)	(4,894)
Proceeds from stock options exercised	32,610	4,925
Cash used for financing activities	(70,704)	(88,356)
Effect of exchange rate changes on cash and cash equivalents	(2,266)	4,269
Net increase in cash and cash equivalents	136,716	69,591
Cash and cash equivalents, beginning of period	83,054	108,656
Cash and cash equivalents, end of period	$ 219,770	$ 178,247