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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating Activities    
Net income $ 21,853 $ 8,757
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,002 5,914
Amortization of debt issuance costs 10 0
Provision for losses on accounts receivable, net of adjustments 294 115
Provision for excess and obsolete inventories (274) 357
Share-based compensation 2,351 5,407
(Gain) loss on disposition of assets (62) 284
Foreign currency transaction loss (gain) 51 (16)
Interest income on note receivable (6) (6)
Deferred (167) 909
Changes in assets and liabilities:    
Accounts receivable (2,789) (4,725)
Income taxes 772 1,432
Inventories 1,020 2,678
Prepaid expenses and other (670) (561)
Accounts payable 2,742 (5,730)
Deferred revenue 229 25
Accrued liabilities 6,241 73
Net cash provided by operating activities 37,597 14,913
Investing Activities    
Capital expenditures (21,877) (8,772)
Proceeds from sale of property, plant and equipment 61 52
Principal payments from note receivable 12 17
Net cash used in investing activities (21,804) (8,703)
Financing Activities    
Stock options exercised 4,497 4,010
Repurchase of stock (11,565) (4,483)
Employee taxes paid by withholding shares (953) (588)
Net cash used in financing activities (8,021) (1,061)
Net increase in cash, cash equivalents and restricted cash 7,772 5,149
Cash, cash equivalents and restricted cash, beginning of period 44,373 1,994
Cash, cash equivalents and restricted cash, end of period $ 52,145 $ 7,143