Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Condensed Consolidated Balance Sheets [Abstract]
Allowances	$ 33,745	$ 32,392
Series A preferred shares, par value	$ 0.001	$ 0.001
Series A preferred shares, shares authorized	1,000,000us-gaap_TemporaryEquitySharesAuthorized	1,000,000us-gaap_TemporaryEquitySharesAuthorized
Series A preferred shares, issued and outstanding	200,000	200,000
Series A preferred shares, redemption value and liquidation preference	$ 202,833	$ 203,067
Preferred shares, par value	$ 0.001	$ 0.001
Preferred shares, authorized	4,000,000us-gaap_PreferredStockSharesAuthorized	4,000,000us-gaap_PreferredStockSharesAuthorized
Preferred shares, outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common shares, par value	$ 0.001	$ 0.001
Common shares, authorized	250,000,000us-gaap_CommonStockSharesAuthorized	250,000,000us-gaap_CommonStockSharesAuthorized
Common shares, issued	92,771,653us-gaap_CommonStockSharesIssued	92,325,201us-gaap_CommonStockSharesIssued
Common shares, outstanding	77,222,053us-gaap_CommonStockSharesOutstanding	78,516,566us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	15,549,600us-gaap_TreasuryStockShares	13,808,635us-gaap_TreasuryStockShares

Allowance for doubtful accounts related to trade receivables and reserves for sales returns.

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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders and are held by the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Securities outstanding equals securities issued minus securities held in treasury.

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Temporary equity redemption value and liquidation preference. The aggregate amount to be paid by the entity upon redemption of the security that is classified as temporary equity. The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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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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