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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Allowances for receivables	$ 30,193us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 32,396us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common Class A [Member]
Class of Stock [Line Items]
Common stock par value per share	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_CommonClassAMember	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_CommonClassAMember
Common stock shares authorized	400,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_CommonClassAMember	400,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_CommonClassAMember
Common stock shares issued	29,192,142us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_CommonClassAMember	29,307,583us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_CommonClassAMember
Common Class B [Member]
Class of Stock [Line Items]
Common stock par value per share	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_CommonClassBMember	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_CommonClassBMember
Common stock shares authorized	150,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_CommonClassBMember	150,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_CommonClassBMember
Common stock shares issued	555,556us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_CommonClassBMember	555,556us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_CommonClassBMember
Common Class C [Member]
Class of Stock [Line Items]
Common stock par value per share	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_CommonClassCMember	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_CommonClassCMember
Common stock shares authorized	100,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_CommonClassCMember	100,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_CommonClassCMember
Common stock shares issued	58,967,502us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_CommonClassCMember	58,967,502us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_CommonClassCMember
Treasury Stock [Member]
Class of Stock [Line Items]
Treasury stock shares	228,537us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_TreasuryStockMember	227,638us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_TreasuryStockMember

X

- Definition

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 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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