Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 37,530	$ 25,871	$ 3,591
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,108	5,628	3,817
Gain on disposal of buildings and equipment	(954)	(362)	(207)
Loss on early extinguishment of debt	0	0	2,224
Deferred interest	0	0	2,728
Share-based compensation	659	524	482
Provision for bad debts	1,083	1,186	938
Deferred tax provision	10,145	14,491	(1,777)
Changes in (net of acquisitions):
Accounts receivable	(6,276)	(14,656)	(15,967)
Prepaid expenses and other assets	(8,550)	(5,521)	(1,166)
Accounts payable	(5,587)	8,356	5,659
Accrued expenses and other liabilities	(2,435)	(2,353)	1,788
Net cash provided by operating activities	36,723	33,164	2,110
Cash flows from investing activities:
Restricted cash	0	0	4,066
Acquisition of business, net of cash acquired	(88,977)	(131,290)	(2,910)
Capital expenditures	(15,140)	(10,105)	(2,500)
Proceeds from sale of buildings and equipment	510	865	264
Net cash used in investing activities	(103,607)	(140,530)	(1,080)
Cash flows from financing activities:
Borrowings under revolving credit facilities	141,115	124,081	88,557
Payments under revolving credit facilities	(141,115)	(144,581)	(103,839)
Long-term debt borrowings	40,500	140,000	1,184
Long-term debt payments	(15,500)	(3,500)	(107,213)
Debt issuance cost	(2,220)	(4,183)	(758)
Payments of contingent earnouts	(83)	(2,553)	0
Proceeds from issuance of common stock (net of issuance costs)	57,119	869	120,232
Redemption of mandatory redeemable preferred stock	(5,000)	0	0
Excess tax benefit on share-based compensation	818	0	0
Reduction of capital lease obligation	(157)	(448)	(373)
Net cash provided by (used in) financing activities	75,477	109,685	(2,210)
Net increase (decrease) in cash and cash equivalents	8,593	2,319	(1,180)
Cash and cash equivalents:
Beginning of period	3,315	996	2,176
End of period	11,908	3,315	996
Supplemental cash flow information:
Cash paid for interest	8,214	3,517	9,153
Cash paid for income taxes (net of refunds)	13,961	1,127	321
Noncash contingent earnout	17,733	2,581	0
Capital expenditures (non-cash)	1,749	0	0
Noncash issuance of common stock for acquisition	0	3,000	0
Noncash Series B convertible preferred stock dividend	$ 0	$ 0	$ 765