Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income		$ 252,308	$ 241,220	$ 159,557
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		32,265	25,296	23,127
Amortization of intangible assets		28,644	22,112	28,861
Amortization of original issue discount and deferred financing costs		4,712	4,749	3,516
Loss on extinguishment of debt	[1]	926	1,332	0
Loss on pension settlement	[2]	10,920	(0)	(0)
Deferred income taxes		18,733	23,600	19,502
Share-based compensation expense	[3]	16,694	14,563	10,205
Other		1,086	2,474	410
Net changes in operating assets and liabilities, net of acquisitions:
Accounts receivable		8,231	(43,243)	(32,857)
Inventories		26,369	(152,594)	(22,986)
Other assets		(358)	(6,362)	(14,783)
Accounts payable		(69,404)	86,359	42,788
Accrued wages and employee benefits		(3,724)	12,626	6,105
Other accrued liabilities		(16,252)	16,972	37,029
Excess tax benefits from equity awards		(2,263)	(1,877)	(3,152)
Net cash provided by operating activities		308,887	247,227	257,322
Investing activities
Proceeds from sale of property and equipment		95	214	82
Proceeds from beneficial interest in securitization transactions		2,630	3,933	3,794
Expenditures for property and equipment		(60,802)	(47,601)	(33,261)
Acquisition of business, net of cash acquired		(112,001)	(65,440)	1,257
Net cash used in investing activities		(170,078)	(108,894)	(28,128)
Financing activities
Proceeds from short-term borrowings		73,340	53,965	101,991
Proceeds from long-term borrowings		1,660	51,425	3,069
Repayments of short-term borrowings		(59,518)	(27,880)	(114,874)
Repayments of long-term borrowings and finance lease obligations		(53,049)	(101,827)	(117,475)
Stock repurchases		0	(25,656)	(30,012)
Payment of contingent acquisition consideration		(5,550)	0	0
Payment of debt issuance costs		(1,473)	(1,702)	(3,901)
Cash dividends paid to noncontrolling interest of subsidiary		(285)	(314)	0
Taxes paid related to equity awards		(6,438)	(5,659)	(5,892)
Proceeds from the exercise of stock options		9,395	5,614	6,951
Net cash used in financing activities		(41,918)	(52,034)	(160,143)
Effect of exchange rate changes on cash and cash equivalents		1,510	(289)	2,149
Net increase in cash and cash equivalents		98,401	86,010	71,200
Cash and cash equivalents at beginning of period		224,482	138,472	67,272
Cash and cash equivalents at end of period		322,883	224,482	138,472
Supplemental disclosure of cash flow information
Interest		35,465	41,007	41,105
Income taxes		$ 61,767	$ 41,044	$ 23,836

[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 pre-tax settlement charges related to the termination of the Company’s domestic pension plan in the fourth quarter of 2019.

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