Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows - operating activities:
Net income including noncontrolling interests	$ 34,354	$ 32,710
Depreciation and amortization	9,332	8,762
Amortization of identifiable intangible assets	9,470	9,461
Deferred income taxes	2,291	732
Excess tax benefits from share-based compensation	(1,217)	(955)
Equity income from unconsolidated entities	(228)	(470)
Other non-cash items	4,611	3,269
Distributions from unconsolidated entities	27	3,316
Changes in operating assets and liabilities, excluding the effect of businesses acquired	(95,801)	(74,646)
Net cash used in operating activities	(37,161)	(17,821)
Cash flows - investing activities:
Payments for acquisitions of businesses, net of cash acquired	(254)	0
Proceeds from sale of property, plant and equipment	484	1,571
Purchase of property, plant and equipment	(9,016)	(6,936)
Net cash used in investing activities	(8,786)	(5,365)
Cash flows - financing activities:
Repayments of long-term debt	(4,378)	(4,380)
Repayments of capital lease obligations	(460)	(985)
Dividends paid to stockholders	(4,879)	(5,039)
Repurchase of common stock	(34,074)	(21,148)
Proceeds from exercise of stock options	0	1,368
Payments to satisfy minimum tax withholding	(4,097)	(1,959)
Issuance of common stock under employee stock purchase plan	1,188	1,018
Payments for contingent consideration arrangements	0	(121)
Distributions to noncontrolling interests	(600)	(7,500)
Excess tax benefits from share-based compensation	0	955
Net cash used in financing activities	(47,300)	(37,791)
Effect of exchange rate changes on cash and cash equivalents	(1,220)	(2,185)
Decrease in cash and cash equivalents	(94,467)	(63,162)
Cash and cash equivalents at beginning of year	486,831	432,056
Cash and cash equivalents at end of period	392,364	368,894
Cash paid for:
Interest	2,011	1,835
Income taxes	14,146	2,581
Non-cash financing activities:
Assets acquired under capital lease obligations	$ 907	$ 6