Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue	$ 3,659,624us-gaap_Revenues	$ 3,287,019us-gaap_Revenues	$ 2,782,604us-gaap_Revenues
Cost of services and products	2,800,423us-gaap_CostOfGoodsAndServicesSold	2,521,483us-gaap_CostOfGoodsAndServicesSold	2,154,746us-gaap_CostOfGoodsAndServicesSold
Gross Margin	859,201us-gaap_GrossProfit	765,536us-gaap_GrossProfit	627,858us-gaap_GrossProfit
Selling, general and administrative expense	230,871	220,420	199,261
Income from Operations	628,330us-gaap_OperatingIncomeLoss	545,116us-gaap_OperatingIncomeLoss	428,597us-gaap_OperatingIncomeLoss
Interest income	293us-gaap_InvestmentIncomeInterest	554us-gaap_InvestmentIncomeInterest	1,935us-gaap_InvestmentIncomeInterest
Interest expense, net of amounts capitalized	(4,708)us-gaap_InterestExpense	(2,194)us-gaap_InterestExpense	(4,218)us-gaap_InterestExpense
Equity earnings of unconsolidated affiliates	(51)	133	1,673
Other income (expense), net	(387)us-gaap_OtherNonoperatingIncomeExpense	(1,273)us-gaap_OtherNonoperatingIncomeExpense	(6,065)us-gaap_OtherNonoperatingIncomeExpense
Income before Income Taxes	623,477	542,336	421,922
Provision for income taxes	195,148us-gaap_IncomeTaxExpenseBenefit	170,836us-gaap_IncomeTaxExpenseBenefit	132,905us-gaap_IncomeTaxExpenseBenefit
Net Income	$ 428,329us-gaap_ProfitLoss	$ 371,500us-gaap_ProfitLoss	$ 289,017us-gaap_ProfitLoss
Cash Dividends declared per Share	$ 1.03	$ 0.84	$ 0.69
Basic Earnings per Share	$ 4.02us-gaap_EarningsPerShareBasic	$ 3.43us-gaap_EarningsPerShareBasic	$ 2.68us-gaap_EarningsPerShareBasic
Weighted Average Number of Shares Outstanding, Basic	106,593	108,158	108,015
Diluted Earnings per Share	$ 4.00us-gaap_EarningsPerShareDiluted	$ 3.42us-gaap_EarningsPerShareDiluted	$ 2.66us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding, Diluted	107,091	108,731	108,617

Income Including Equity Affiliate Earnings Before Income Taxes

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The net result for the period of deducting operating expenses from operating revenues.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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