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Interest Expense Interest expense (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	May 01, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt Instrument, Face Amount	$ 1,250,000		$ 1,250,000
Stock Issued During Period, Shares, Conversion of Convertible Securities			26.1
Stock Issued During Period, Value, Conversion of Convertible Securities			$ 3,170,000
Convertible Debt, Fair Value Disclosures					$ 651,300
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments			3,770,000
Convertible Debt, Current	0		0		$ 644,700	$ 627,616
Gain (Loss) on Extinguishment of Debt	$ 6,554	$ 0	$ 6,554	$ 0

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- Definition

The amount of subsequent adjustments to additional paid in capital for convertible financial instruments where a component of equity and a component of debt are recognized.

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The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Face (par) amount of debt instrument at time of issuance.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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The gross value of stock issued during the period upon the conversion of convertible securities.

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