Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income		$ 88,001	$ 37,558
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation		12,169	11,271
Amortization of intangible assets		11,114	14,312
Amortization of original issue discount and deferred financing costs		2,367	1,308
Loss on extinguishment of debt	[1]	1,332
Deferred income taxes		6,257	16,500
Share-based compensation expense	[2]	6,991	5,818
Other		599	377
Net changes in operating assets and liabilities, net of acquisitions:
Accounts receivable		(24,876)	2,504
Inventories		(85,592)	(8,236)
Other assets		(13,047)	1,069
Accounts payable		33,442	(26,560)
Accrued wages and employee benefits		4,510	1,902
Other accrued liabilities		36,578	(3,144)
Excess tax benefits from equity awards		(188)	(403)
Net cash provided by operating activities		79,657	54,276
Investing activities
Proceeds from sale of property and equipment		196	45
Proceeds from beneficial interests in securitization transactions		1,929	1,398
Expenditures for property and equipment		(12,326)	(10,030)
Acquisition of business, net of cash acquired		(71,926)	1,160
Net cash used in investing activities		(82,127)	(7,427)
Financing activities
Proceeds from short-term borrowings		12,133	62,435
Proceeds from long-term borrowings		50,000	3,069
Repayments of short-term borrowings		(8,172)	(72,971)
Repayments of long-term borrowings and capital lease obligations		(50,797)	(9,806)
Stock repurchases		(25,656)	(30,012)
Cash dividends paid to noncontrolling interest of subsidiary		(314)
Payment of debt issuance costs		(1,473)	(1,517)
Taxes paid related to equity awards		(1,725)	(1,958)
Proceeds from exercise of stock options		2,124	1,254
Net cash used in financing activities		(23,880)	(49,506)
Effect of exchange rate changes on cash and cash equivalents		(408)	2,456
Net decrease in cash and cash equivalents		(26,758)	(201)
Cash and cash equivalents at beginning of period		138,472	67,272
Cash and cash equivalents at end of period		$ 111,714	$ 67,071

[1] Represents the non-cash write-off of original issue discount and deferred financing costs due to a voluntary prepayment of Term Loan debt.

[2] Represents share-based compensation expense to account for stock options, restricted stock and other stock awards over their respective vesting periods.