Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Net Income	$ 37,782	$ 28,003
Cash flows from operating activities:
Net income	37,782	28,003
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,864	6,772
Gain on disposal of buildings and equipment	(473)	(502)
Stock-based compensation	1,155	493
Provision for bad debts	1,009	811
Excess tax benefit on stock-based compensation	(3,765)	0
Deferred tax provision	2,874	1,014
Changes in:
Accounts receivable	(26,614)	(20,504)
Prepaid expenses and other assets	5,496	(6,314)
Accounts payable	754	2,253
Accrued expenses and other liabilities	(7,082)	6,272
Net cash provided by operating activities	24,000	18,298
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(100,659)	(59,468)
Capital expenditures	(24,379)	(12,026)
Proceeds from sale of buildings and equipment	1,263	1,252
Net cash used in investing activities	(123,775)	(70,242)
Cash flows from financing activities:
Borrowings under revolving credit facilities	110,827	141,177
Payments under revolving credit facilities	(77,826)	(113,782)
Long-term debt borrowings	22,000	40,500
Long-term debt payments	(10,688)	(11,250)
Debt issuance cost	(1,472)	(1,374)
Payments of contingent earnouts	2,407	0
Proceeds from issuance of common stock, net of issuance costs	52,474	823
Redemption of mandatory redeemable preferred stock	0	(5,000)
Excess tax benefit from share-based compensation	3,765	0
Reduction of capital lease obligation	(49)	(143)
Net cash provided by financing activities	96,624	50,951
Net decrease in cash and cash equivalents	(3,151)	(993)
Cash and cash equivalents:
Beginning of period	11,908	3,315
End of period	8,757	2,322
Supplemental cash flow information:
Cash paid for interest	4,567	6,248
Cash paid for income taxes, net	18,951	9,168
Noncash contingent earnout	7,678	11,733
Capital expenditures incurred but not yet paid	$ 0	$ 961