Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 103,372	$ 58,205
Adjustments to reconcile net income to cash flows provided by operating activities:
Depreciation and amortization	33,720	30,663
Stock-based compensation expense	11,421	10,984
Deferred taxes	183	0
Other non-cash items	1,728	854
Changes in assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(46,028)	(40,761)
Inventories, net	13,451	(39,289)
Prepaid expenses and other assets	(7,659)	1,976
Accounts payable, trade	23,827	1,612
Accrued expenses and other liabilities	30,093	20,507
Net cash flows provided by operating activities	164,108	44,751
Cash flows from investing activities:
Capital expenditures	(21,927)	(21,808)
Acquisitions of businesses, net of cash acquired	(34,237)	(41,058)
Proceeds from sales of fixed assets	533	2,141
Other investing activities	(316)	(272)
Net cash flows used for investing activities	(55,947)	(60,997)
Cash flows from financing activities:
Exercise of stock-based awards, net of shares tendered for payment of taxes	409	(275)
Proceeds from line of credit borrowings	81,458	563,325
Repayments under line of credit borrowings	(81,458)	(537,146)
Proceeds from shelf-loan borrowing	0	50,000
Payment of dividends	(22,078)	(48,227)
Payment of contingent consideration related to acquisitions	(2,719)	(3,963)
Other financing activities	(1,018)	(220)
Net cash flows (used for) provided by financing activities	(25,406)	23,494
Net increase in cash and cash equivalents	82,755	7,248
Cash and cash equivalents at beginning of period	12,305	4
Cash and cash equivalents at end of period	95,060	7,252
Cash paid during the period for:
Interest	1,525	1,477
Income taxes, net of refunds	$ 51,524	$ 21,963