CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS
Accounts receivable, related allowances (in dollars)	$ 12,646	$ 11,004
Intangible assets, accumulated amortization (in dollars)	$ 241,731	$ 215,341
Common stock voting, par value (in dollars per share)	$ 0.0025	$ 0.0025
Common stock voting, shares authorized (in shares)	900,000,000us-gaap_CommonStockSharesAuthorized	900,000,000us-gaap_CommonStockSharesAuthorized
Common stock voting, shares issued (in shares)	261,420,126us-gaap_CommonStockSharesIssued	258,840,350us-gaap_CommonStockSharesIssued
Common stock voting, shares outstanding (in shares)	241,449,423us-gaap_CommonStockSharesOutstanding	222,867,408us-gaap_CommonStockSharesOutstanding
Treasury stock, shares (in shares)	19,970,703us-gaap_TreasuryStockShares	35,972,942us-gaap_TreasuryStockShares

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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