Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income (loss)	$ (733,630)	$ 107,443
Adjustments to reconcile net income (loss) to net cash used in operating activities
Depreciation and amortization	124,169	140,443
Unrealized foreign currency exchange rate gain (loss)	(3,676)	12,885
Loss on disposal of property and equipment	3,547	2,884
Impairment charges	452,945	0
Amortization of bond premium	6,910	190
Stock-based compensation	32,770	38,048
Deferred income taxes	19,172	23,827
Changes in reserves and allowances	22,910	(22,778)
Changes in operating assets and liabilities:
Accounts receivable	(105,874)	(187,585)
Inventories	(159,930)	123,364
Prepaid expenses and other assets	64,404	73,753
Other non-current assets	(288,111)	5,939
Accounts payable	17,972	(67,336)
Accrued expenses and other liabilities	301,720	(52,466)
Customer refund liability	(23,164)	(88,710)
Income taxes payable and receivable	18,159	(7,433)
Net cash provided by (used in) operating activities	(249,707)	102,468
Cash flows from investing activities
Purchases of property and equipment	(71,639)	(105,767)
Purchases of other assets	0	(1,273)
Purchase of businesses	(38,848)	0
Net cash used in investing activities	(110,487)	(107,040)
Cash flows from financing activities
Proceeds from long term debt and revolving credit facility	1,288,753	25,000
Payments on long term debt and revolving credit facility	(800,000)	(162,817)
Purchase of capped call	(47,850)	0
Employee taxes paid for shares withheld for income taxes	(3,285)	(4,088)
Proceeds from exercise of stock options and other stock issuances	3,855	5,797
Payments of debt financing costs	(5,150)	(2,661)
Other financing fees	0	77
Net cash provided by (used in) financing activities	436,323	(138,692)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,398	4,809
Net increase in (decrease in) cash, cash equivalents and restricted cash	78,527	(138,455)
Cash, cash equivalents and restricted cash
Beginning of period	796,008	566,060
End of period	874,535	427,605
Non-cash investing and financing activities
Change in accrual for property and equipment	$ (12,449)	$ (15,620)