Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income (loss)	$ (437,012)	$ 72,793	$ 108,787
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	101,927	59,443	55,393
Share-based compensation expense	16,376	11,911	12,042
Goodwill and intangible asset impairment charges	439,613	0	0
Deferred income tax (benefit) expense	(35,018)	(49,988)	4,218
Provision for losses on accounts receivable	9,430	2,674	377
Changes in operating assets and liabilities:
Accounts receivable	11,106	(100,010)	(25,244)
Merchandise inventories	(65,451)	(57,032)	22,589
Accounts payable	92,179	143,947	43,430
Net change in other assets and liabilities	(23,604)	(33,263)	(37,559)
Other, net	6,043	6,299	3,662
Cash provided by operating activities	115,589	56,774	187,695
Investing activities:
Acquisitions, net of cash acquired	(751,834)	(366,569)	0
Additions to computer software and intangible assets	(20,812)	(16,124)	(9,819)
Additions to property and equipment	(44,873)	(34,613)	(20,302)
Proceeds from sale of property and equipment	1,690	663	5,375
Cash used for investing activities	(815,829)	(416,643)	(24,746)
Financing activities:
Proceeds from issuance of debt	695,750	250,000	0
Proceeds from revolving credit facility	105,500	104,600	0
Repayment of debt	(16,250)	(3,125)	0
Financing costs paid	(28,512)	(1,798)	0
Cash dividends paid	(48,200)	(63,151)	(63,382)
Repurchases of common stock	0	(5,000)	(71,028)
Other, net	(7,217)	(8,720)	(8,294)
Cash provided by (used for) financing activities	701,071	272,806	(142,704)
Effect of exchange rate changes on cash and cash equivalents	(1,986)	6,097	4,223
Net (decrease) increase in cash and cash equivalents	(1,155)	(80,966)	24,468
Cash and cash equivalents at beginning of year	104,522	185,488	161,020
Cash and cash equivalents at end of year	$ 103,367	$ 104,522	$ 185,488