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Subsequent Events (Details) - 6.50% Convertible Senior Notes Due 2024 - Convertible Debt $ / shares in Units, $ in Millions			2 Months Ended
	Mar. 01, 2019 USD ($) day $ / shares	Feb. 19, 2019	Mar. 12, 2019 USD ($)	Dec. 31, 2018
Subsequent Event [Line Items]
Stated interest rate				6.50%
Subsequent Event
Subsequent Event [Line Items]
Debt instrument, face amount | $	$ 78.5		$ 78.5
Proceeds from issuance of debt | $	$ 75.8		$ 75.8
Debt instrument, convertible, conversion ratio		0.1858045
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares	$ 5.38
Debt instrument, convertible, threshold percentage of stock price trigger	130.00%
Debt instrument, convertible, threshold trading days | day	20
Debt instrument, convertible, threshold consecutive trading days | day	30
Debt instrument, redemption price, percentage	100.00%

X

- Definition

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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