Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Consolidated net income	$ 5,298	$ 9,386
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34,972	34,054
Amortization of non-cash interest	7,143	5,210
Stock-based compensation	(2,858)	5,717
Reserves on current assets	5,232	3,785
Net loss on strategic investments	1,411
Other non-cash adjustments	5,403	3,172
Deferred income taxes	9,105	1,547
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	22,409	1,620
Inventory	(21,135)	(19,292)
Prepaid expenses and other current assets	(2,042)	(1,399)
Accounts payable and accrued liabilities	(5,271)	(2,249)
Accrued payroll and related expenses	(45,927)	(14,815)
Income taxes	(8,515)	(2,261)
Net cash provided by operating activities	5,225	24,475
Investing activities:
Purchases of intangible assets	(2,490)	(6,827)
Purchases of property and equipment	(28,116)	(33,929)
Net cash used in investing activities	(30,606)	(40,756)
Financing activities:
Purchases of treasury stock	(78,818)	(8,177)
Payment of contingent consideration	(346)	(1,435)
Proceeds from issuance of convertible debt, net of issuance costs	437,686
Proceeds from sale of warrants	47,070
Purchase of convertible note hedge	(78,300)
Other financing activities	(1,233)	1,556
Net cash provided by (used in) financing activities	326,059	(8,056)
Effect of exchange rate changes on cash	(1,736)	(112)
Increase (decrease) in cash, cash equivalents and restricted cash	298,942	(24,449)
Cash, cash equivalents and restricted cash at beginning of period	214,528	120,235
Cash, cash equivalents and restricted cash at end of period	$ 513,470	$ 95,786