Consolidated Statement of Cash Flows Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows from Operating Activities:
Net Income	$ 12,250	$ 11,750
Adjustments to reconcile net income to net cash used for operating activities, net of acquisition impact:
Gain on disposition of property and equipment	300	60
Depreciation	6,450	6,230
Amortization of intangible assets	4,200	3,500
Amortization of debt issue costs	910	760
Deferred income taxes	670	9,530
Non-cash compensation expense	1,410	860
Excess tax benefit from stock based compensation	(1,770)	(1,510)
Increase in receivables	(33,260)	(41,710)
Increase in inventories	(15,040)	(2,760)
Increase in prepaid expenses and other assets	(1,000)	(3,240)
Decrease in accounts payable and accrued liabilities	(15,550)	(11,550)
Other, net	1,630	1,200
Net cash used for operating activities, net of acquisition impact	(39,400)	(27,000)
Cash Flows from Investing Activities:
Capital expenditures	(11,370)	(6,810)
Acquisition of businesses, net of cash acquired	(59,190)	0
Net proceeds from disposition of assets	320	500
Net cash used for investing activities	(70,240)	(6,310)
Cash Flows from Financing Activities:
Proceeds from borrowings on term loan facilities	36,420	1,530
Repayments of borrowings on term loan facilities	(31,010)	(650)
Proceeds from borrowings on revolving credit facilities and accounts receivable facility	180,000	135,700
Repayments of borrowings on revolving credit facilities and accounts receivable facility	(156,000)	(135,700)
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(990)	(720)
Proceeds from exercise of stock options	5,490	180
Excess tax benefits from stock based compensation	1,770	1,510
Net cash provided by financing activities	35,680	1,850
Decrease for the period	(73,960)	(31,460)
At beginning of period	88,920	46,370
At end of period	14,960	14,910
Supplemental disclosure of cash flow information:
Cash paid for interest	3,080	4,730
Cash paid for taxes	$ 8,050	$ 2,600