Consolidated Statement of Cash Flows Statement (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows from Operating Activities:
Net Income	$ 67,810	$ 71,790
Adjustments to reconcile net income to net cash used for operating activities, net of acquisition impact:
Gain on dispositions of assets	6,320	10,350
Business Combination, Bargain Purchase, Gain Recognized, Amount	0	(2,880)
Depreciation	24,190	22,190
Amortization of intangible assets	16,630	14,420
Amortization of debt issue costs	1,430	1,310
Deferred income taxes	(6,910)	(3,180)
Non-cash compensation expense	6,690	7,110
Excess tax benefit from stock based compensation	(1,100)	(1,280)
Increase in receivables	(43,520)	(48,560)
Decrease in inventories	7,380	1,800
(Increase) decrease in prepaid expenses and other assets	2,320	(7,100)
Decrease in accounts payable and accrued liabilities	(3,460)	(4,280)
Other, net	(240)	290
Net cash provided by operating activities, net of acquisition impact	64,900	41,280
Cash Flows from Investing Activities:
Capital expenditures	(27,770)	(35,150)
Acquisition of businesses, net of cash acquired	(27,510)	(56,000)
Net proceeds from disposition of assets	6,990	10,720
Net cash used for investing activities	(48,290)	(80,430)
Cash Flows from Financing Activities:
Proceeds from Issuance of Common Stock	0	174,720
Proceeds from borrowings on term loan facilities	134,080	150,090
Repayments of borrowings on term loan facilities	(139,800)	(151,710)
Proceeds from borrowings on revolving credit facilities and accounts receivable facility	732,480	632,740
Repayments of borrowings on revolving credit facilities and accounts receivable facility	(687,520)	(575,730)
Distributions to noncontrolling interests	(580)	(1,910)
Payment for noncontrolling interests	(51,000)	0
Proceeds from Other Financing Activities	0	1,030
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(2,780)	(3,930)
Proceeds from exercise of stock options	480	1,340
Excess tax benefits from stock based compensation	1,100	1,280
Net cash provided by (used for) financing activities	(13,540)	227,920
Increase for the period	3,070	188,770
At beginning of period	27,000	20,580
At end of period	30,070	209,350
Supplemental disclosure of cash flow information:
Cash paid for interest	7,960	12,610
Cash paid for taxes	$ 25,610	$ 29,880