Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income (loss)	$ (772,576)	$ 5,128
Adjustments to reconcile net income (loss) to net cash used in operating activities
Depreciation and amortization	86,919	93,721
Unrealized foreign currency exchange rate gain (loss)	(1,134)	(3,077)
Loss on disposal of property and equipment	825	2,447
Impairment charges	449,090	0
Amortization of bond premium	1,867	127
Stock-based compensation	23,258	25,635
Deferred income taxes	22,296	(13,890)
Changes in reserves and allowances	19,772	(10,196)
Changes in operating assets and liabilities:
Accounts receivable	126,059	(75,116)
Inventories	(307,430)	62,302
Prepaid expenses and other assets	77,368	64,533
Other non-current assets	(301,523)	12,812
Accounts payable	46,449	57,674
Accrued expenses and other liabilities	230,670	(48,094)
Customer refund liability	(18,630)	(60,089)
Income taxes payable and receivable	7,310	(1,210)
Net cash provided by (used in) operating activities	(309,410)	112,707
Cash flows from investing activities
Purchases of property and equipment	(50,862)	(77,046)
Purchases of other assets	0	(997)
Purchase of businesses	(38,190)	0
Net cash used in investing activities	(89,052)	(78,043)
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	(550,000)	(162,817)
Purchase of capped call	(47,850)	0
Employee taxes paid for shares withheld for income taxes	(2,732)	(3,077)
Proceeds from exercise of stock options and other stock issuances	2,859	4,238
Payments of debt financing costs	(4,823)	(2,661)
Other financing fees	0	76
Net cash provided by (used in) financing activities	686,207	(139,241)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	4,351	4,463
Net increase in (decrease in) cash, cash equivalents and restricted cash	292,096	(100,114)
Cash, cash equivalents and restricted cash
Beginning of period	796,008	566,060
End of period	1,088,104	465,946
Non-cash investing and financing activities
Change in accrual for property and equipment	$ (11,246)	$ (17,392)