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Long-Term Debt - 1.00% Notes due 2020 (Details) - 1.00% Notes	Jun. 08, 2015 USD ($) d $ / shares Rate	Dec. 31, 2019 $ / shares	Dec. 31, 2018
Debt Instrument [Line Items]
Debt instrument, interest rate		1.00%
Convertible Debt
Debt Instrument [Line Items]
Principal amount of debt | $	$ 690,000,000.0
Debt instrument, interest rate	1.00%	1.00%	1.00%
Conversion rate | Rate	5.40643%
Conversion price per share (in dollars per share) | $ / shares	$ 18.50	$ 18.50
Debt Conversion One | Convertible Debt
Debt Instrument [Line Items]
Threshold trading days	20
Threshold consecutive trading days	30
Threshold percentage of stock price trigger (greater than or equal to)	130.00%
Debt Conversion Two | Convertible Debt
Debt Instrument [Line Items]
Threshold consecutive trading days	5
Period immediately following consecutive trading days (in business days)	5 days
Ratio of trading price per 1000 principal amount (as a percent) (less than)	0.98

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- Definition

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

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

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