Condensed Consolidated Statement Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 21,877us-gaap_ProfitLoss	$ 28,765us-gaap_ProfitLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	21,287	13,137
Amortization of discount or premium of investments	273	352
Amortization of financing costs and discounts	2,222	162
Share-based compensation	3,004us-gaap_ShareBasedCompensation	2,384us-gaap_ShareBasedCompensation
Excess tax benefits from share-based compensation	(334)	(4,082)
Provision for doubtful accounts	1,610us-gaap_ProvisionForDoubtfulAccounts	732us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	(494)us-gaap_DeferredIncomeTaxExpenseBenefit	(211)us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain) loss on sale of available-for-sale investments	(24)	(40)
Decrease (increase) in:
Accounts receivable	9,254	8,452
Prepaid expenses and other current assets	(4)	(1,657)
Other assets	25	147
(Decrease) increase in:
Accounts payable and accrued expenses	(12,902)	(16,228)
Income taxes payable	(1,283)	4,723
Deferred revenue	(1,340)	205
Liability for uncertain tax positions	2,595	351
Other	(50)	102
Net cash provided by operating activities	45,716	37,294
Cash flows from investing activities:
Maturity of certificates of deposit	0	8,210
Sales of available-for-sale investments	28,994	29,705
Purchase of available-for-sale investments	(19,819)	(11,213)
Purchases of property and equipment	(2,956)	(2,936)
Acquisition of businesses, net of cash received	(72,215)	(49,068)
Purchases of intangible assets	(327)	(915)
Net cash used in investing activities	(66,323)	(26,217)
Cash flows from financing activities:
Repurchases of common stock and restricted stock	(705)	(4,042)
Issuance of common stock under employee stock purchase plan	61us-gaap_ProceedsFromStockPlans	55us-gaap_ProceedsFromStockPlans
Exercise of stock options	65	4,926
Dividends paid	(14,110)us-gaap_PaymentsOfDividends	(12,418)us-gaap_PaymentsOfDividends
Excess tax benefits from share-based compensation	334	4,082
Deferred payments for acquisitions	(2,356)	(3,314)
Proceeds from (Payments for) Other Financing Activities	(50)	0
Net cash used in financing activities	(16,761)	(10,711)
Effect of exchange rate changes on cash and cash equivalents	(4,278)	(99)
Net change in cash and cash equivalents	(41,646)	267
Cash and cash equivalents	392,017	208,068
Cash and cash equivalents at end of period	$ 392,017	$ 208,068

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with the amount received from the stock plan during the period.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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