CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Operating activities:
Net income	$ 90,019	$ 179,842
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	33,543	32,594
Amortization of deferred financing costs and debt discount	6,876	6,330
Impairment of intangible and long-lived assets	0	3
Share-based compensation expense	14,927	15,346
Deferred tax (benefit) provision	(5,631)	1,322
Allowance for doubtful accounts	(140)	(68)
Reserve for inventory obsolescence	6,898	6,146
Foreign currency exchange rate loss	1,793	1,480
Changes in cash due to:
Receivables	944	(12,763)
Inventories	(6,064)	11,888
Prepaid expenses	33,299	2,535
Accounts payable	1,337	(2,024)
Accrued liabilities	(17,812)	16,634
Deferred revenue	5,535	(12,465)
Other long term assets and liabilities, net	(1,114)	(12,819)
Income taxes	(12,729)	20,658
Cash provided by operating activities	151,681	254,639
Investing activities:
Capital expenditures	(10,479)	(11,932)
Capitalized software expenditures	(24,082)	(20,115)
Cash paid for acquisitions	0	(3,063)
Other items, net	244	(9,843)
Cash used for investing activities	(34,317)	(44,953)
Financing activities:
Net payments on revolver	0	(25,000)
Payments on long-term debt	(107,750)	(57,750)
Taxes paid related to net share settlement of equity awards	(4,796)	(20,564)
Proceeds from stock options exercised	475	32,610
Other items, net	(350)	0
Cash used for financing activities	(112,421)	(70,704)
Effect of exchange rate changes on cash and cash equivalents	(2,755)	(2,266)
Net increase in cash and cash equivalents	2,188	136,716
Cash and cash equivalents, beginning of period	236,974	83,054
Cash and cash equivalents, end of period	$ 239,162	$ 219,770