Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 5,983	$ 9,651
Trade accounts receivable, less allowance for doubtful accounts of $2,286 at March 31, 2013 and $2,052 at December 31, 2012	94,290	93,696
Inventories	21,536	22,121
Prepaid expenses and other current assets	10,447	10,156
Income tax receivable	4,498	3,171
Deferred income taxes	227	235
Total current assets	136,981	139,030
Property and equipment, less accumulated depreciation of $120,324 at March 31, 2013 and $119,257 at December 31, 2012	65,646	65,491
Goodwill, net	210,975	211,903
Other intangible assets, net:
Customer relationships	27,512	29,010
Other	577	633
Deferred income taxes	5,685	5,983
Other assets	6,811	6,771
Total assets	454,187	458,821
Current liabilities:
Trade accounts payable	23,177	18,137
Accrued expenses	59,513	57,080
Deferred income taxes	2,475	2,482
Income taxes payable	501	609
Current portion of long-term debt	3,904	4,262
Total current liabilities	89,570	82,570
Long-term liabilities:
Long-term debt	69,875	78,724
Deferred income taxes	3,184	3,208
Other long-term liabilities	43,022	43,536
Total long-term liabilities	116,081	125,468
Stockholders' equity:
Common stock, $0.008 par value, 40,000,000 shares authorized, 31,252,263 and 31,172,666 shares issued at March 31, 2013 and December 31, 2012, respectively, 26,161,107 and 26,113,544 shares outstanding at March 31, 2013 and December 31, 2012, respectively	228	227
Additional paid-in capital	210,741	209,556
Retained earnings	93,248	93,897
Accumulated other comprehensive income, net	9,518	11,859
Treasury stock, at cost, 5,091,156 and 5,059,122 shares of common stock at March 31, 2013 and December 31, 2012, respectively	(65,199)	(64,756)
Total stockholders' equity	248,536	250,783
Total liabilities and stockholders' equity	$ 454,187	$ 458,821