CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income	$ 16,487	[1]	$ 16,389	$ 12,931
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,994		7,241	7,289
Intangible asset impairment	0		1,163	0
Contingent consideration write-off	0		(1,235)	0
Restricted stock compensation	1,494		1,254	1,794
Deferred taxes	(1,062)		341	(558)
Other noncash items	(317)		(227)	(240)
Changes in operating assets and liabilities, net of acquired businesses:
Trade accounts receivable	(8,093)		(8,871)	1,440
Inventories	(10,980)		(5,933)	555
Prepaid expenses and other assets	1,186		(1,080)	800
Current income taxes	(1,168)		1,731	(343)
Accounts payable	3,062		4,354	639
Accrued expenses	196		1,048	2,538
Net cash provided by operating activities	8,799		16,175	26,845
Investing activities:
Additions to property, plant and equipment	(18,783)		(10,267)	(7,151)
Acquisitions, net of cash acquired	(216,398)		0	0
Other, net	181		270	6
Net cash used by investing activities	(235,000)		(9,997)	(7,145)
Financing activities:
Proceeds from issuance of debt	229,124		0	0
Principal payments on long-term debt and notes payable	(118)		(180)	(327)
Advances on revolving line of credit	40,278		0	13,520
Payments on revolving line of credit	(34,042)		0	(30,520)
Prepaid financing costs	(12,736)		0	0
Other, net	174		(77)	(457)
Net cash provided by (used by) financing activities	222,680		(257)	(17,784)
Net (decrease) increase in cash and cash equivalents	(3,521)		5,921	1,916
Cash and cash equivalents, beginning of year	7,868		1,947	31
Cash and cash equivalents, end of year	4,347		7,868	1,947
Cash payments for: [Abstract]
Interest paid	585		490	531
Income taxes paid, net of refunds received	10,261		5,032	6,360
Supplemental disclosure of noncash transactions:
Fair value of common stock issued to acquire Valent	15,000		0	0
Contingent consideration	7,950		0	0
Equipment acquired under capital lease	$ 746		$ 0	$ 0

[1] The fourth quarter of 2012 includes $4,860 in acquisition fees related to Valent.