Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 5,438	$ 11,908
Accounts receivable, net of allowances of $2,957 and $1,476, respectively	171,165	122,947
Deferred income taxes	1,847	3,800
Prepaid expenses and other current assets	35,010	26,461
Total current assets	213,460	165,116
Property and equipment, net of accumulated depreciation of $30,869 and $20,108, respectively	96,558	68,576
Other assets:
Goodwill	518,743	442,143
Intangible assets, net	31,363	12,710
Other noncurrent assets	11,756	12,263
Total other assets	561,862	467,116
Total assets	871,880	700,808
Current liabilities:
Current maturities of long-term debt	10,938	17,000
Accounts payable	67,141	54,887
Accrued expenses and other liabilities	33,271	29,132
Total current liabilities	111,350	101,019
Long-term debt, net of current maturities	181,702	144,500
Other long-term liabilities	78,463	63,210
Total liabilities	371,515	308,729
Commitments and Contingencies (Note 13)
Stockholders' investment:
Common stock $.01 par value; 100,000 shares authorized; 37,564 and 34,371 shares issued and outstanding	376	344
Additional paid-in capital	384,292	325,034
Retained earnings	115,697	66,701
Total stockholders’ investment	500,365	392,079
Total liabilities and stockholder' investment	$ 871,880	$ 700,808