Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 5,423	$ 11,908
Accounts receivable, net of allowances of $1,182 and $1,476, respectively	152,752	122,947
Deferred income taxes	3,595	3,800
Prepaid expenses and other current assets	22,257	26,461
Total current assets	184,027	165,116
Property and equipment, net of accumulated depreciation of $25,663 and $20,108, respectively	93,176	68,576
Other assets:
Goodwill	459,808	442,143
Intangible assets, net	14,374	12,710
Other noncurrent assets	10,363	12,263
Total other assets	484,545	467,116
Total assets	761,748	700,808
Current liabilities:
Current maturities of long-term debt	17,000	17,000
Accounts payable	63,571	54,887
Accrued expenses and other liabilities	27,874	29,132
Total current liabilities	108,445	101,019
Long-term debt, net of current maturities	158,000	144,500
Other long-term liabilities	65,330	63,210
Total liabilities	331,775	308,729
Common stock $.01 par value; 100,000 shares authorized; 35,858 and 34,371 shares issued and outstanding	358	344
Additional paid-in capital	338,362	325,034
Retained earnings	91,253	66,701
Total stockholders’ investment	429,973	392,079
Total liabilities and stockholders’ investment	$ 761,748	$ 700,808