Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows - operating activities:
Net income including noncontrolling interests	$ 32,710us-gaap_ProfitLoss	$ 41,842us-gaap_ProfitLoss
Depreciation and amortization	8,762us-gaap_Depreciation	8,867us-gaap_Depreciation
Amortization of identifiable intangible assets	9,461us-gaap_AmortizationOfIntangibleAssets	9,504us-gaap_AmortizationOfIntangibleAssets
Deferred income taxes	732us-gaap_DeferredIncomeTaxExpenseBenefit	4,513us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on sale of subsidiary	0us-gaap_GainLossOnSaleOfBusiness	596us-gaap_GainLossOnSaleOfBusiness
Excess tax benefits from share-based compensation	(955)	(4,869)
Equity (income) loss from unconsolidated entities	(470)	460
Other non-cash items	3,259us-gaap_OtherNoncashIncomeExpense	1,038us-gaap_OtherNoncashIncomeExpense
Distributions from unconsolidated entities	3,316	72
Changes in operating assets and liabilities	(74,636)	(86,339)
Net cash used in operating activities	(17,821)	(24,316)
Cash flows - investing activities:
Proceeds from sale of subsidiary	0	1,121
Proceeds from sale of property, plant and equipment	1,571	931
Purchase of property, plant and equipment	(6,936)	(8,073)
Investments in and advances to unconsolidated entities and joint ventures	0	(300)
Net cash used in investing activities	(5,365)	(6,321)
Cash flows - financing activities:
Repayments of long-term debt	(4,380)us-gaap_RepaymentsOfLongTermDebt	(4,377)us-gaap_RepaymentsOfLongTermDebt
Repayments of capital lease obligations	(985)	(491)
Dividends paid to stockholders	(5,039)us-gaap_PaymentsOfDividendsCommonStock	(5,353)us-gaap_PaymentsOfDividendsCommonStock
Repurchase of common stock	(21,148)	0
Proceeds from exercise of stock options	1,368	3,974
Payments to satisfy minimum tax withholding	(1,959)	(1,481)
Issuance of common stock under employee stock purchase plan	1,018us-gaap_ProceedsFromStockPlans	866us-gaap_ProceedsFromStockPlans
Payments for contingent consideration arrangements	(121)	0
Distributions to noncontrolling interests	(7,500)	(900)
Excess tax benefits from share-based compensation	955	4,869
Net cash used in financing activities	(37,791)	(2,893)
Effect of exchange rate changes on cash and cash equivalents	(2,185)	385
Decrease in cash and cash equivalents	(63,162)	(33,145)
Cash and cash equivalents at beginning of year	432,056	439,813
Cash and cash equivalents at end of period	368,894	406,668
Cash paid for:
Interest	1,835us-gaap_InterestPaid	1,527us-gaap_InterestPaid
Income taxes	2,581us-gaap_IncomeTaxesPaid	2,295us-gaap_IncomeTaxesPaid
Non-cash financing activities:
Assets acquired under capital lease obligations	$ 6us-gaap_CapitalLeaseObligationsIncurred	$ 50us-gaap_CapitalLeaseObligationsIncurred

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