Exercise price per share or per unit of warrants or rights outstanding.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Price of a single share of a number of saleable stocks of a company.

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Convertible debt authorized for issuance

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Convertible note hedge, shares covered by hedge

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Debt instrument, convertible threshold percentage of stock price and conversion rate

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Percentage of warrant strike price in excess of stock price

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Convertible Debt (Narrative) (Details) $ / shares in Units, shares in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 item $ / shares	Dec. 31, 2016 $ / shares shares	Jan. 31, 2017 USD ($)
Debt Instrument [Line Items]
Percentage of warrant strike price in excess of stock price	60.00%
Share Price \| $ / shares		$ 19.93
Initial Purchasers [Member]
Debt Instrument [Line Items]
Convertible note hedge, shares covered by hedge \| shares		8,630
Shares issuable under warrant agreement \| shares		8,630
3.375% Convertible Notes [Member]
Debt Instrument [Line Items]
Interest rate	3.375%
Conversion ratio, shares	40.1405
Conversion price \| $ / shares	$ 24.91
Warrant strike price \| $ / shares	$ 31.89
3.375% Convertible Notes [Member] \| Initial Purchasers [Member]
Debt Instrument [Line Items]
Convertible debt authorized for issuance \| $			$ 215,000,000
Interest rate	3.375%
Maturity date	Dec. 15, 2023
3.375% Convertible Notes [Member] \| Conversion Scenario 1 [Member]
Debt Instrument [Line Items]
Threshold within consecutive trading days	20
Threshold of consecutive trading days	30
3.375% Convertible Notes [Member] \| Conversion Scenario 1 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stock price trigger percent	130.00%
3.375% Convertible Notes [Member] \| Conversion Scenario 2 [Member]
Debt Instrument [Line Items]
Threshold within consecutive trading days	5
Threshold of consecutive trading days	10
Threshold percentage of stock price and conversion rate	98.00%