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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Operating activities:    
Net income $ 39,059 $ 10,579
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 11,154 12,862
Amortization of deferred financing costs and debt discount 1,914 1,485
Impairment of intangible and long-lived assets 0 97
Write-off of net assets due to cessation of Spain operations 0 70
Share-based compensation expense 4,384 2,334
Deferred tax (benefit) provision (457) 4,395
Allowance for doubtful accounts (49) (872)
Reserve for inventory obsolescence 6,423 2,949
Foreign currency exchange rate (gain) loss (367) 572
Changes in cash due to:    
Receivables (5,562) (1,011)
Inventories 1,241 4,637
Prepaid expenses (15,088) (10,131)
Accounts payable 7,510 3,249
Accrued liabilities (2,175) (25,794)
Deferred revenue 22,932 31,054
Other long term assets and liabilities, net (6,328) (38)
Income taxes 8,868 5,902
Cash provided by operating activities 73,459 42,339
Investing activities:    
Capital expenditures (1,753) (3,411)
Capitalized software expenditures (5,966) (7,071)
Other items, net (24) (3)
Cash used for investing activities (7,743) (10,485)
Financing activities:    
Net borrowings (payments) on revolver (25,000) 0
Payments on long-term debt (19,250) (5,250)
Taxes paid related to net share settlement of equity awards (2,128) (1,170)
Proceeds from stock options exercised 14,679 666
Cash used for financing activities (31,699) (5,754)
Effect of exchange rate changes on cash and cash equivalents 544 437
Net increase in cash and cash equivalents 34,561 26,537
Cash and cash equivalents, beginning of period 83,054 108,656
Cash and cash equivalents, end of period $ 117,615 $ 135,193