Consolidated Statement of Cash Flows Statement (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net Income	$ 41,840	$ 29,420
Adjustments to reconcile net income to net cash (used for) provided by operating activities, net of acquisition impact:
Gain (loss) on disposition of property and equipment	(10)	320
Depreciation	14,560	12,690
Amortization of intangible assets	10,230	9,180
Amortization of debt issue costs	870	1,600
Deferred income taxes	(3,470)	200
Debt extinguishment costs	0	6,560
Non-cash compensation expense	4,750	3,510
Excess tax benefit from stock based compensation	(1,180)	(2,130)
Increase in receivables	(54,460)	(41,630)
(Increase) decrease in inventories	1,320	(31,270)
Increase in prepaid expenses and other assets	(2,240)	(1,740)
Increase in accounts payable and accrued liabilities	2,320	8,470
Other, net	(1,010)	580
Net cash provided by (used for) operating activities, net of acquisition impact	13,540	(4,880)
Cash Flows from Investing Activities:
Capital expenditures	(25,920)	(26,640)
Acquisition of businesses, net of cash acquired	(46,610)	(61,820)
Net proceeds from disposition of assets	700	2,770
Net cash used for investing activities	(71,830)	(85,690)
Cash Flows from Financing Activities:
Proceeds from sale of common stock	0	79,040
Proceeds from borrowings on term loan facilities	106,420	69,530
Repayments of borrowings on term loan facilities	(104,830)	(69,150)
Proceeds from borrowings on revolving credit facilities and accounts receivable facility	475,890	412,900
Repayments of borrowings on revolving credit facilities and accounts receivable facility	(418,900)	(412,900)
Repurchase of senior secured notes	0	(50,000)
Payments of Debt Extinguishment and Issuance Costs	0	4,880
Distributions to noncontrolling interests	(1,350)	(410)
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	(3,760)	(990)
Proceeds from exercise of stock options	860	5,660
Excess tax benefits from stock based compensation	1,180	2,130
Net cash provided by financing activities	56,540	30,930
Decrease for the period	(1,750)	(59,640)
At beginning of period	20,580	88,920
At end of period	18,830	29,280
Supplemental disclosure of cash flow information:
Cash paid for interest	8,280	17,790
Cash paid for taxes	$ 13,830	$ 13,840