Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income		$ 164,523	$ 77,334
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation		18,332	17,137
Amortization of intangible assets		16,792	21,554
Amortization of original issue discount and deferred financing costs		3,554	2,400
Loss on extinguishment of debt	[1]	1,332
Deferred income taxes		17,218	25,336
Share-based compensation expense	[2]	9,910	8,402
Other		1,249	361
Net changes in operating assets and liabilities, net of acquisitions:
Accounts receivable		(55,649)	(68,003)
Inventories		(99,957)	9,379
Other assets		(16,488)	(3,852)
Accounts payable		47,559	(206)
Accrued wages and employee benefits		13,044	6,288
Other accrued liabilities		18,011	25,148
Excess tax benefits from equity awards		(432)	(661)
Net cash provided by operating activities		138,998	120,617
Investing activities
Proceeds from sale of property and equipment		213	77
Proceeds from beneficial interests in securitization transactions		2,825	2,102
Expenditures for property and equipment		(25,577)	(16,658)
Acquisition of business, net of cash acquired		(71,926)	1,257
Net cash used in investing activities		(94,465)	(13,222)
Financing activities
Proceeds from short-term borrowings		28,332	74,443
Proceeds from long-term borrowings		51,425	3,069
Repayments of short-term borrowings		(12,478)	(80,952)
Repayments of long-term borrowings and capital lease obligations		(51,164)	(13,051)
Stock repurchases		(25,656)	(30,012)
Cash dividends paid to noncontrolling interest of subsidiary		(314)
Payment of debt issuance costs		(1,702)	(1,517)
Taxes paid related to equity awards		(2,777)	(2,479)
Proceeds from exercise of stock options		5,191	1,717
Net cash used in financing activities		(9,143)	(48,782)
Effect of exchange rate changes on cash and cash equivalents		139	2,895
Net increase in cash and cash equivalents		35,529	61,508
Cash and cash equivalents at beginning of period		138,472	67,272
Cash and cash equivalents at end of period		$ 174,001	$ 128,780

[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.