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Subsequent Event (Notes)	6 Months Ended
	Jun. 30, 2012
Subsequent Events [Abstract]
Subsequent Events [Text Block]	On July 16, 2013, we issued $400 million aggregate principal amount of senior unsecured notes due 2021 which will bear interest at 6.625% per year and will mature on July 15, 2021. We intend to use the net proceeds (i) to pay the cash consideration required to purchase our 5.25% Contingent Convertible Senior Notes due 2029 (the “2029 Notes”) tendered in connection with an offer to exchange  any and all of our outstanding 2029 Notes for cash and newly issued shares of common stock if we commence such an offer, depending on market conditions and other factors, including the payment of any applicable accrued and unpaid interest on our 2029 Notes, (ii) to pay the cash consideration required to purchase our 3.5% Convertible Senior Notes due 2015 (the “2015 Notes”) tendered in connection with an offer to exchange any and all of our outstanding 2015 Notes for cash and newly issued shares of common stock if we commence such an offer, depending on market conditions and other factors, including the payment of any applicable accrued and unpaid interest on our 2015 Notes, (iii) to repay all amounts outstanding under our existing revolving credit facility (we repaid all amounts outstanding on July 17, 2013) and (iv) to pay related fees and expenses.   Any proceeds we are unable to use in the manner described above, due to market conditions or otherwise, or any excess proceeds after those uses  may be used to tender for, redeem or repurchase any of the 2029 Notes or 2015 Notes that remain outstanding and/or for general corporate purposes.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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