Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 74,345	$ 62,266	$ 50,119
Adjustments to reconcile net income to cash flows provided by operating activities:
Depreciation and amortization	41,624	32,596	27,500
Stock-based compensation expense	14,043	10,817	10,839
Deferred taxes	1,062	(5,493)	269
Other non-cash items	1,335	2,796	1,867
Changes in assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	2,082	(606)	(9,013)
Inventories, net	(31,276)	(21,940)	(3,403)
Prepaid expenses and other assets	(2,249)	(4,610)	(2,288)
Accounts payable, trade	(21,783)	21,269	2,296
Accrued expenses and other liabilities	15,835	9,925	4,491
Net cash flows provided by operating activities	95,018	107,020	82,677
Cash flows from investing activities:
Capital expenditures	(28,989)	(42,458)	(32,595)
Acquisitions of businesses	(41,058)	(106,782)	(4,750)
Proceeds from note receivable	2,000	1,750	0
Proceeds from sales of fixed assets	2,337	3,587	1,444
Other investing activities	(406)	(171)	(154)
Net cash flows used for investing activities	(66,116)	(144,074)	(36,055)
Cash flows from financing activities:
Exercise of stock-based awards, net of shares tendered for payment of taxes	1,470	5,769	15,175
Proceeds from line of credit borrowings	614,629	425,330	135,452
Repayments under line of credit borrowings	(630,279)	(409,680)	(135,452)
Payment of special dividend	(48,227)	(46,706)	0
Proceeds from shelf-loan borrowing	50,000	0	0
Payment of contingent consideration related to acquisitions	(3,974)	(3,739)	(5,456)
Other financing activities	(220)	(196)	0
Net cash flows (used for) provided by financing activities	(16,601)	(29,222)	9,719
Net increase (decrease) in cash	12,301	(66,276)	56,341
Cash and cash equivalents at beginning of year	4	66,280	9,939
Cash and cash equivalents at end of year	12,305	4	66,280
Cash paid during the year for:
Interest	2,113	641	364
Income taxes, net of refunds	$ 33,782	$ 30,947	$ 26,799