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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Operating activities:    
Net income $ 100,409 $ 54,301
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 38,331 39,145
Amortization of deferred financing costs 4,292 4,631
Impairment of intangible and long-lived assets 670 91
Write-off of net assets due to cessation of Spain operations 70 0
Share-based compensation expense 9,372 4,366
Deferred tax provision 6,393 9,171
Allowance for doubtful accounts (775) 43
Reserve for inventory obsolescence 6,280 3,823
Foreign currency exchange rate loss 158 222
Gain on early extinguishment of debt (1,840) 0
Changes in cash due to:    
Receivables 6,768 2,546
Inventories 4,821 (4,830)
Prepaid expenses 9,711 (8,313)
Accounts payable (19,622) (7,209)
Accrued liabilities (21,459) (20,123)
Deferred revenue 16,692 12,199
Other long term assets and liabilities, net 5,907 2,726
Income taxes 18,627 1,128
Cash provided by operating activities 184,805 93,917
Investing activities:    
Capital expenditures (10,755) (4,556)
Capitalized software expenditures (20,242) (21,888)
Cash paid for acquisitions 0 (2,898)
Other items, net (130) (174)
Cash used for investing activities (31,127) (29,516)
Financing activities:    
Payments on revolver 0 (48,000)
Payments on long-term debt (88,387) (160,073)
Taxes paid related to net share settlement of equity awards (4,894) 0
Excess tax benefit of share-based compensation 0 964
Proceeds from stock options exercised 4,925 35
Payment of dividends 0 (11)
Cash used for financing activities (88,356) (207,085)
Effect of exchange rate changes on cash and cash equivalents 4,269 202
Net increase (decrease) in cash and cash equivalents 69,591 (142,482)
Cash and cash equivalents, beginning of period 108,656 241,526
Cash and cash equivalents, end of period $ 178,247 $ 99,044