Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 10,582	$ 7,931
Cash flows from operating activities:
Net income	10,582	7,931
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,996	2,272
Gain on disposal of buildings and equipment	69	(160)
Stock-based compensation	254	137
Provision for bad debts	89	218
Deferred tax provision	633	1,736
Changes in:
Accounts receivable	(16,459)	(6,906)
Prepaid expenses and other assets	3,098	(3,127)
Accounts payable	4,926	1,710
Accrued expenses and other liabilities	1,754	516
Net cash provided by operating activities	8,942	4,327
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(172)	(6,158)
Capital expenditures	(9,389)	(3,259)
Proceeds from sale of buildings and equipment	320	326
Net cash used in investing activities	(9,241)	(9,091)
Cash flows from financing activities:
Borrowings under revolving credit facilities	0	40,408
Payments under revolving credit facilities	0	(30,408)
Long-term debt payments	(4,250)	(3,500)
Debt issuance cost	0	(50)
Proceeds from issuance of common stock, net of issuance costs	8,820	1,023
Redemption of mandatory redeemable preferred stock	0	(5,000)
Reduction of capital lease obligation	(15)	(119)
Net cash provided by financing activities	4,555	2,354
Net increase (decrease) in cash and cash equivalents	4,256	(2,410)
Cash and cash equivalents:
Beginning of period	11,908	3,315
End of period	16,164	905
Supplemental cash flow information:
Cash paid for interest	1,412	1,798
Cash paid for income taxes, net	378	229
Noncash contingent earnout	$ 430	$ 694