Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 58,205	$ 50,270
Adjustments to reconcile net income to cash flows provided by operating activities:
Depreciation and amortization	30,663	23,475
Stock-based compensation expense	10,984	7,909
Other non-cash items	854	2,837
Changes in assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(40,761)	(27,162)
Inventories, net	(39,289)	(16,526)
Prepaid expenses and other assets	1,976	(3,668)
Accounts payable, trade	1,612	16,276
Accrued expenses and other liabilities	20,507	13,553
Net cash flows provided by operating activities	44,751	66,964
Cash flows from investing activities:
Capital expenditures	(21,808)	(30,032)
Acquisitions of businesses	(41,058)	(100,157)
Proceeds from note receivable	0	750
Proceeds from sales of fixed assets	2,141	3,344
Other investing activities	(272)	(66)
Net cash flows used for investing activities	(60,997)	(126,161)
Cash flows from financing activities:
Exercise of stock-based awards, net of shares tendered for payment of taxes	(275)	3,555
Proceeds from line of credit borrowings	563,325	330,346
Repayments under line of credit borrowings	(537,146)	(290,346)
Proceeds from shelf-loan borrowing	50,000	0
Payment of special dividend	(48,227)	(46,706)
Payment of contingent consideration related to acquisitions	(3,963)	(3,732)
Other financing activities	(220)	(196)
Net cash flows provided by (used for) financing activities	23,494	(7,079)
Net increase (decrease) in cash	7,248	(66,276)
Cash and cash equivalents at beginning of period	4	66,280
Cash and cash equivalents at end of period	7,252	4
Cash paid during the period for:
Interest	1,477	409
Income taxes, net of refunds	$ 21,963	$ 27,301