Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Net Income	$ 39,595	$ 37,782
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,189	12,864
Gain on disposal of property and equipment	(195)	(473)
Share-based compensation	1,750	1,155
Provision for bad debts	2,268	1,009
Excess tax benefit on stock-based compensation	(1,442)	(3,765)
Deferred tax provision	5,229	2,874
Changes in:
Accounts receivable	(55,317)	(26,614)
Prepaid expenses and other assets	(7,238)	5,496
Accounts payable	19,356	754
Accrued expenses and other liabilities	(4,643)	(7,082)
Net cash provided by operating activities	17,552	24,000
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(232,026)	(100,659)
Capital expenditures	(30,556)	(24,379)
Proceeds from sale of buildings and equipment	3,778	1,263
Net cash used in investing activities	(258,804)	(123,775)
Cash flows from financing activities:
Borrowings under revolving credit facilities	341,165	110,827
Payments under revolving credit facilities	(117,099)	(77,826)
Long-term debt borrowings	33,750	22,000
Long-term debt payments	(6,875)	(10,688)
Debt issuance cost	2,447	1,472
Payments of contingent earnouts	4,804	2,407
Proceeds from Issuance of Common Stock, net of issuance costs	3,414	52,474
Excess tax benefit from share-based compensation	1,442	3,765
Reduction of capital lease obligation	(66)	(49)
Net cash provided by financing activities	248,480	96,624
Net increase (decrease) in cash and cash equivalents	7,228	(3,151)
Cash and cash equivalents:
Beginning of period	5,438	11,908
End of period	12,666	8,757
Supplemental cash flow information:
Cash paid for interest	7,719	4,567
Cash paid for income taxes, net	14,759	18,951
Noncash contingent earnout	$ 0	$ 7,678