Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 13,732	$ 36,889
Trade accounts receivable, less allowance for doubtful accounts of $1,926 in 2011 and $1,525 in 2010	99,967	95,207
Inventories	24,672	18,250
Prepaid expenses and other current assets	14,894	9,356
Income tax receivable	5,620	2,943
Deferred income taxes	682	347
Total current assets	159,567	162,992
Property and equipment, net	60,064	48,684
Goodwill, net	205,365	193,626
Other intangible assets, net:
Customer relationships	41,709	36,461
Other	354	817
Deferred income taxes	5,933	868
Other assets	6,521	6,411
Total assets	479,513	449,859
Current liabilities:
Trade accounts payable	18,366	21,930
Accrued expenses	60,636	64,007
Deferred income taxes	3,209	3,260
Income taxes	511	1,038
Current portion of long-term debt	21,442	29,587
Total current liabilities	104,164	119,822
Long-term liabilities:
Long-term debt	73,737	37,080
Deferred income taxes	13,476	9,135
Other long-term liabilities	14,211	19,696
Total long-term liabilities	101,424	65,911
Stockholders' equity:
Common stock, $0.008 par value, 40,000,000 shares authorized, 30,766,517 and 30,506,252 shares issued at December 31, 2011 and 2010, respectively, 25,703,125 and 25,761,334 shares outstanding at December 31, 2011 and 2010, respectively	225	224
Additional paid-in capital	203,811	200,205
Retained earnings	125,619	113,258
Accumulated other comprehensive income, net	9,080	11,247
Treasury stock, at cost, 5,063,392 and 4,744,918 shares of common stock at December 31, 2011 and 2010, respectively	(64,810)	(60,808)
Total stockholders' equity	273,925	264,126
Total liabilities and stockholders' equity	$ 479,513	$ 449,859