Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net Income	$ 24,552	$ 18,131
Cash flows from operating activities:
Net income	24,552	18,131
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,197	4,718
Gain on disposal of buildings and equipment	(506)	(248)
Stock-based compensation	704	319
Provision for bad debts	383	389
Deferred tax provision	634	644
Changes in:
Accounts receivable	(26,432)	(13,224)
Prepaid expenses and other assets	6,581	(5,180)
Accounts payable	5,828	2,859
Accrued expenses and other liabilities	(2,341)	3,954
Net cash provided by operating activities	17,600	12,362
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(29,769)	(21,467)
Capital expenditures	(18,349)	(6,812)
Proceeds from sale of buildings and equipment	937	578
Net cash used in investing activities	(47,181)	(27,701)
Cash flows from financing activities:
Borrowings under revolving credit facilities	57,040	95,948
Payments under revolving credit facilities	(35,040)	(71,008)
Long-term debt payments	(8,500)	(7,000)
Debt issuance cost	(114)	(127)
Payments of contingent earnouts	2,407	0
Proceeds from issuance of common stock, net of issuance costs	12,148	1,121
Redemption of mandatory redeemable preferred stock	0	(5,000)
Reduction of capital lease obligation	(31)	(130)
Net cash provided by financing activities	23,096	13,804
Net decrease in cash and cash equivalents	(6,485)	(1,535)
Cash and cash equivalents:
Beginning of period	11,908	3,315
End of period	5,423	1,780
Supplemental cash flow information:
Cash paid for interest	2,824	3,802
Cash paid for income taxes, net	10,182	377
Noncash contingent earnout	5,778	4,362
Capital Expenditures Incurred but Not yet Paid	$ 596	$ 0