Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 8,192	$ 13,732
Trade accounts receivable, less allowance for doubtful accounts of $1,955 at March 31, 2012 and $1,926 at December 31, 2011	96,278	99,967
Inventories	27,880	24,672
Prepaid expenses and other current assets	13,323	14,894
Income tax receivable	4,386	5,620
Deferred income taxes	719	682
Total current assets	150,778	159,567
Property and equipment, less accumulated depreciation of $113,951 at March 31, 2012 and $109,925 at December 31, 2011	62,573	60,064
Goodwill, net	211,547	205,365
Other intangible assets, net:
Customer relationships	36,822	41,709
Other	911	354
Deferred income taxes	6,025	5,933
Other assets	7,339	6,521
Total assets	475,995	479,513
Current liabilities:
Trade accounts payable	18,079	18,366
Accrued expenses	70,613	60,636
Deferred income taxes	3,210	3,209
Income taxes payable	1,020	511
Current portion of long-term debt	4,597	21,442
Total current liabilities	97,519	104,164
Long-term liabilities:
Long-term debt	75,575	73,737
Deferred income taxes	13,857	13,476
Other long-term liabilities	13,741	14,211
Total long-term liabilities	103,173	101,424
Stockholders' equity:
Common stock, $0.008 par value, 40,000,000 shares authorized, 30,945,995 and 30,766,517 shares issued at March 31, 2012 and December 31, 2011, respectively; 25,883,654 and 25,703,125 shares outstanding at March 31, 2012 and December 31, 2011, respectively	226	225
Additional paid-in capital	206,394	203,811
Retained earnings	121,943	125,619
Accumulated other comprehensive income, net	11,537	9,080
Treasury stock, at cost, 5,062,341 and 5,063,392 shares of common stock at March 31, 2012 and December 31, 2011, respectively	(64,797)	(64,810)
Total stockholders' equity	275,303	273,925
Total liabilities and stockholders' equity	$ 475,995	$ 479,513