Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 67,889	$ 74,120	$ 13,186	$ 28,214	$ 142,009	$ 41,400
Adjustments to reconcile net income to cash flows provided by operating activities:
Depreciation and amortization					51,270	48,799
Stock-based compensation expense					13,859	7,404
Other non-cash items					4,305	546
Changes in assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net					(142,489)	(62,611)
Inventories, net					(115,314)	63,404
Prepaid expenses and other assets					(16,401)	(27,679)
Accounts payable, trade					71,144	20,917
Accrued expenses and other liabilities					15,476	9,921
Net cash flows provided by operating activities					23,859	102,101
Cash flows from investing activities:
Capital expenditures					(42,005)	(14,549)
Acquisitions of businesses, net of cash acquired					(103,858)	(94,713)
Other investing activities					(566)	4,096
Net cash flows used in investing activities					(146,429)	(105,166)
Cash flows from financing activities:
Vesting of stock-based awards, net of shares tendered for payment of taxes					(7,925)	(4,616)
Proceeds from revolving credit facility					554,693	276,542
Repayments under revolving credit facility					(719,747)	(197,330)
Repayments under term loan and other borrowings					(8,652)	(9,554)
Proceeds from issuance of convertible notes					460,000	0
Purchases of convertible note hedge contracts					(100,142)	0
Proceeds from issuance of warrants concurrent with note hedge contracts					48,484	0
Payment of debt issuance costs					(11,844)	0
Payment of dividends					(41,678)	(32,670)
Payment of contingent consideration and holdbacks related to acquisitions					(4,387)	0
Other financing activities					0	(279)
Net cash flows provided by financing activities					168,802	32,093
Effect of exchange rate changes on cash and cash equivalents					(92)	(2,115)
Net increase in cash and cash equivalents					46,140	26,913
Cash and cash equivalents at beginning of period		$ 51,821		$ 35,359	51,821	35,359	$ 35,359
Cash and cash equivalents cash at end of period	$ 97,961		$ 62,272		97,961	62,272	$ 51,821
Supplemental disclosure of cash flow information:
Cash paid during the period for interest					6,496	9,593
Cash paid during the period for income taxes, net of refunds					55,449	(611)
Purchase of property and equipment in accrued expenses					$ 3,952	$ 2,624