CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 46,964	$ 29,450
Adjustments to reconcile net income to net cash provided by operating activities:
Inventory step-up amortization		1,598
Depreciation and amortization	11,834	8,444
Amortization of debt discount and issuance costs	452	2,828
Stock-based compensation expense	7,915	6,541
Deferred income taxes, net	1,045	789
Contingent consideration	(2,411)
Other	73	6
Changes in operating assets and liabilities, excluding impact of acquisitions:
Accounts receivable	(6,269)	(19,779)
Unbilled receivables	11
Inventories	(30,037)	(17,025)
Prepaid expenses and other assets	272	(2,414)
Other assets	1,310	538
Accounts payable	2,200	3,725
Accrued expenses	(9,999)	(4,906)
Long-term liabilities	(247)	(533)
Total cash provided by operating activities	23,113	9,262
Cash flows from investing activities:
Acquisitions, net of cash acquired		71
Additions to capitalized software costs	(1,027)	(1,484)
Purchases of property, plant and equipment	(27,204)	(7,584)
Sale of property, plant and equipment	17
Total cash used in investing activities	(28,214)	(8,997)
Cash flows from financing activities:
Proceeds from exercise of stock options	296	508
Payment of tax withholding obligation on vesting of restricted stock	(12,311)
Repayment of convertible senior notes	(6)	(1)
Total cash provided by financing activities	(12,021)	507
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,052)	(6,746)
Net (decrease) increase in cash, cash equivalents and restricted cash	(19,174)	(5,974)
Cash, cash equivalents and restricted cash, beginning of period	603,814	717,292
Cash and cash equivalents, end of period	584,640	711,318
Supplemental disclosure of non-cash investing and financing activities:
Assets acquired under operating leases	$ 1,119	$ 3,182