Common Stock	9 Months Ended
Sep. 30, 2017
Equity [Abstract]
Common Stock	Note 12 – Common Stock In March 2017, we completed a public offering of our common stock and issued a total of 1,536,259 shares for total cash proceeds of $399.6 million (including 95,420 shares purchased by our Chief Executive Officer for $25.0 million), net of underwriting discounts and offering costs. In April 2017, our Chief Executive Officer exercised his right under the indenture to convert all of his zero-coupon convertible senior notes due in 2020, which had an aggregate principal amount of $10.0 million. As a result, on April 26, 2017, we issued 33,333 shares of our common stock to our Chief Executive Officer in accordance with the specified conversion rate, and we recorded an increase to additional paid-in capital of $10.3 million (see Note 11, Convertible and Long-Term Debt Obligations). In June 2017, we issued 1,163,442 shares of our common stock pursuant to exchange agreements entered into with holders of $144.8 million in aggregate principal amount of the 2018 Notes (see Note 11, Convertible and Long-Term Debt Obligations). As a result, we recorded an increase to additional paid-in capital of $141.8 million. In addition, we amended and settled early the associated portions of the bond hedges and warrants entered into in connection with the 2018 Notes, resulting in a net cash inflow of $43.6 million, which was recorded as an increase to additional paid-in capital. In the third quarter of 2017, we issued 250,198 shares of our common stock and paid $32.7 million in cash pursuant to conversions by or exchange agreements entered into with holders of $42.7 million in aggregate principal amount of the 2018 Notes (see Note 11, Convertible and Long-Term Debt Obligations). As a result, we recorded an increase to additional paid-in capital of $9.3 million. In addition, we settled portions of the bond hedges and warrants entered into in connection with the 2018 Notes, resulting in a net cash inflow of $6.3 million (which was recorded as an increase to additional paid-in capital), the issuance of 17,433 shares of our common stock and the receipt of 169,890 shares of our common stock.

Note 12 – Common Stock

In March 2017, we completed a public offering of our common stock and issued a total of 1,536,259 shares for total cash proceeds of $399.6 million (including 95,420 shares purchased by our Chief Executive Officer for $25.0 million), net of underwriting discounts and offering costs.

In April 2017, our Chief Executive Officer exercised his right under the indenture to convert all of his zero-coupon convertible senior notes due in 2020, which had an aggregate principal amount of $10.0 million. As a result, on April 26, 2017, we issued 33,333 shares of our common stock to our Chief Executive Officer in accordance with the specified conversion rate, and we recorded an increase to additional paid-in capital of $10.3 million (see Note 11, Convertible and Long-Term Debt Obligations).

In June 2017, we issued 1,163,442 shares of our common stock pursuant to exchange agreements entered into with holders of $144.8 million in aggregate principal amount of the 2018 Notes (see Note 11, Convertible and Long-Term Debt Obligations). As a result, we recorded an increase to additional paid-in capital of $141.8 million. In addition, we amended and settled early the associated portions of the bond hedges and warrants entered into in connection with the 2018 Notes, resulting in a net cash inflow of $43.6 million, which was recorded as an increase to additional paid-in capital.

In the third quarter of 2017, we issued 250,198 shares of our common stock and paid $32.7 million in cash pursuant to conversions by or exchange agreements entered into with holders of $42.7 million in aggregate principal amount of the 2018 Notes (see Note 11, Convertible and Long-Term Debt Obligations). As a result, we recorded an increase to additional paid-in capital of $9.3 million. In addition, we settled portions of the bond hedges and warrants entered into in connection with the 2018 Notes, resulting in a net cash inflow of $6.3 million (which was recorded as an increase to additional paid-in capital), the issuance of 17,433 shares of our common stock and the receipt of 169,890 shares of our common stock.