Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 16,164	$ 11,908
Accounts receivable, net of allowances of $1,229 and $1,476, respectively	139,082	122,947
Deferred income taxes	3,595	3,800
Prepaid expenses and other current assets	24,006	26,461
Total current assets	182,847	165,116
Property and equipment, net of accumulated depreciation of $22,576 and $20,108, respectively	74,211	68,576
Other assets:
Goodwill	441,667	442,143
Intangible assets, net	13,059	12,710
Other noncurrent assets	11,906	12,263
Total other assets	466,632	467,116
Total assets	723,690	700,808
Current liabilities:
Current maturities of long-term debt	17,000	17,000
Accounts payable	59,879	54,887
Accrued expenses and other liabilities	26,814	29,132
Total current liabilities	103,693	101,019
Long-term debt, net of current maturities	140,250	144,500
Other long-term liabilities	67,520	63,210
Total liabilities	311,463	308,729
Common stock $.01 par value; 100,000 shares authorized; 35,427 and 34,371 shares issued and outstanding	354	344
Additional paid-in capital	334,590	325,034
Retained earnings	77,283	66,701
Total stockholders’ investment	412,227	392,079
Total liabilities and stockholders’ investment	$ 723,690	$ 700,808