Convertible Debt (Notes)	6 Months Ended
Convertible Debt (Notes)	Jun. 30, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Convertible Debt In the second quarter of 2014, $61.1 million principal amount of the Company's $400.0 million aggregate principal amount of Notes were surrendered for conversion. In accordance with the terms of the Notes, the Company elected to settle these conversion obligations through a combination of cash, in an amount equal to the principal amount of the converted Notes, and shares of the Company's Common Stock in respect of any amounts due in excess thereof. Consequently, upon settlement of the Notes during the second quarter of 2014, the Company (i) paid $61.1 million in cash, (ii) issued 521,876 shares of Common Stock, (iii) recognized a $10.8 million loss on the debt extinguishment, and (iv) allocated $156.7 million of the settlement consideration provided to the Note holders to the reacquisition of the equity component of the Notes, and recognized such amount as a reduction of stockholder's equity. In connection with the initial offering of the Notes in October 2011, the Company entered into convertible note hedge and warrant transactions with multiple counterparties, which were recorded to additional paid-in capital. As a result of the Note conversions in the second quarter of 2014, the Company exercised a proportionate amount of its convertible note hedges, for which the Company received 521,876 shares of Common Stock, which was equivalent to the number of shares the Company was required to issue to settle the non-cash portion of the related Note conversions. The shares received were recorded as Treasury Stock, at cost, in the Company's Balance Sheet and Statement of Stockholders' Equity. Also during the second quarter of 2014, the Company entered into agreements to reduce the number of warrants held by each of the warrant holders in proportion to the amount of Notes converted. Pursuant to the agreements, the Company paid an aggregate amount of $143.0 million to the warrant holders to reduce the maximum number of shares of Common Stock issuable upon exercise of the warrants from 4,760,840 to 4,033,324 (subject to adjustment from time to time as provided in the applicable warrant agreements). The remaining warrants expire, and will be exercisable, at various dates during 2017.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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