Consolidated Statement of Cash Flows Statement (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities:
Net Income	$ 71,790	$ 49,380
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisition impact:
Gain on dispositions of property and equipment	10,350	330
Bargain purchase gain	(2,880)	0
Depreciation	22,190	18,990
Amortization of intangible assets	14,420	14,460
Amortization of debt issue costs	1,310	2,240
Deferred income taxes	(3,180)	(3,480)
Debt extinguishment costs	0	6,560
Non-cash compensation expense	7,110	6,640
Excess tax benefit from stock based compensation	(1,280)	(2,310)
Increase in receivables	(48,560)	(38,750)
(Increase) decrease in inventories	1,800	(31,440)
Increase in prepaid expenses and other assets	(7,100)	(600)
Decrease in accounts payable and accrued liabilities	(4,280)	(6,130)
Other, net	290	170
Net cash provided by operating activities, net of acquisition impact	41,280	15,400
Cash Flows from Investing Activities:
Capital expenditures	(35,150)	(36,440)
Acquisition of businesses, net of cash acquired	(56,000)	(84,600)
Net proceeds from disposition of assets	10,720	2,950
Cash Flows from Financing Activities:
Proceeds from sale of common stock in connection with the Company's equity offering, net of issuance costs	174,720	79,040
Proceeds from borrowings on term loan facilities	150,090	140,370
Repayments of borrowings on term loan facilities	(151,710)	(130,850)
Proceeds from borrowings on revolving credit facilities and accounts receivable facility	632,740	555,300
Repayments of borrowings on revolving credit facilities and accounts receivable facility	(575,730)	(555,300)
Repurchase of senior secured notes	0	(50,000)
Senior secured notes redemption premium and debt financing fees	0	4,880
Distributions to noncontrolling interests	(1,910)	(820)
Proceeds from contingent consideration related to disposition of businesses	1,030	0
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(3,930)	(990)
Proceeds from exercise of stock options	1,340	5,680
Excess tax benefits from stock based compensation	1,280	2,310
Net cash provided by financing activities	227,920
At beginning of period	20,580	88,920
At end of period	209,350
Supplemental disclosure of cash flow information:
Cash paid for interest	12,610	20,990
Cash paid for taxes	$ 29,880	$ 23,000