Consolidated Statement of Cash Flows Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net Income	$ 14,040	$ 12,250
Adjustments to reconcile net income to net cash used for operating activities, net of acquisition impact:
Gain (loss) on disposition of property and equipment	(10)	300
Depreciation	7,050	6,450
Amortization of intangible assets	5,080	4,200
Amortization of debt issue costs	440	910
Deferred income taxes	(1,640)	670
Non-cash compensation expense	2,680	1,410
Excess tax benefit from stock based compensation	(910)	(1,770)
Increase in receivables	(38,280)	(33,260)
Increase in inventories	(3,690)	(15,040)
Increase in prepaid expenses and other assets	(3,560)	(1,000)
Decrease in accounts payable and accrued liabilities	(18,710)	(15,550)
Other, net	(440)	1,630
Net cash used for operating activities, net of acquisition impact	(37,930)	(39,400)
Cash Flows from Investing Activities:
Capital expenditures	(13,950)	(11,370)
Acquisition of businesses, net of cash acquired	(28,230)	(59,190)
Net proceeds from disposition of assets	520	320
Net cash used for investing activities	(41,660)	(70,240)
Cash Flows from Financing Activities:
Proceeds from borrowings on term loan facilities	54,110	36,420
Repayments of borrowings on term loan facilities	(48,840)	(31,010)
Proceeds from borrowings on revolving credit facilities and accounts receivable facility	268,800	180,000
Repayments of borrowings on revolving credit facilities and accounts receivable facility	(190,800)	(156,000)
Distributions to noncontrolling interests	(550)	0
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(3,530)	(990)
Proceeds from exercise of stock options	170	5,490
Excess tax benefits from stock based compensation	910	1,770
Net cash provided by (used for) financing activities	80,270	35,680
Increase (Decrease) for the period	680	(73,960)
At beginning of period	20,580	88,920
At end of period	21,260	14,960
Supplemental disclosure of cash flow information:
Cash paid for interest	3,900	3,080
Cash paid for taxes	$ 7,280	$ 8,050