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Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 41,164	$ 30,949
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,944	6,078
Deferred taxes	7,189	7,325
Compensation expense related to share-based compensation plans	3,675	2,720
(Gain) loss on sale of assets	(16)	46
Changes in operating assets and liabilities, net of effects of acquisition:
Restricted investments	362	(938)
Accounts receivable, net	(57,275)	(66,443)
Prepaid taxes	167	464
Prepaid expenses and other current assets	(2,275)	517
Other assets	406	(491)
Accounts payable	29,316	39,692
Accrued expenses	12,881	6,497
Non-current liabilities	(344)	847
Net cash provided by operating activities	46,194	27,263
Cash flows from investing activities:
Proceeds from sale of equipment	316	871
Purchases of property and equipment	(35,382)	(13,362)
Cash used in acquisitions, net of cash acquired	(83,057)
Net cash used in investing activities	(118,123)	(12,491)
Cash flows from financing activities:
Proceeds from stock options exercised	78	18
Purchase of treasury stock	(1,513)	(23,822)
Capital lease payments	(185)
Excess tax benefits from share-based compensation	1,069	198
Net cash used in financing activities	(551)	(23,606)
Effect of exchange rate changes on cash and cash equivalents	(12)	14
Net decrease in cash and cash equivalents	(72,492)	(8,820)
Cash and cash equivalents beginning of period	115,144	126,863
Cash and cash equivalents end of period	42,652	118,043
Supplemental disclosures of cash paid for:
Interest	238	38
Income taxes	$ 11,784	$ 9,937

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