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Debt And Credit Arrangements - 2018 Notes (Details)		3 Months Ended
	Nov. 06, 2017 USD ($)	Mar. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Aug. 03, 2011 USD ($) $ / shares shares
Debt Instrument
Amortization of Debt Issuance Costs		$ 300,000	$ 300,000
Convertible Notes, Due 2018 | Convertible Debt
Debt Instrument
Debt instrument stated interest rate					2.00%
Debt instrument face amount		$ 57,100,000.0		$ 57,100,000	$ 250,000,000.0
Debt instrument effective interest rate		7.90%			7.90%
Repayment of debt	$ 195,900,000
Debt repurchased	192,900,000
Accrued interest on debt instrument	1,000,000
Debt extinguished	$ 194,900,000
Discount rate	4.80%
Convertible debt	$ 184,700,000	$ 55,900,000		$ 55,100,000
Loss on extinguishment of debt	4,300,000
Interest paid	1,000,000
Share conversion rate per 1,000 principal | shares		14.4865
Debt instrument, conversion price (usd per share) | $ / shares		$ 69.03
Debt instrument, threshold for consecutive trading days		20
Debt instrument, threshold for trading days		30
Applicable conversion price threshold (as percentage)		130.00%
Applicable conversion price, less than (as percentage)		97.00%
Maximum days after five trading days		5 days
Warrant exercise price (usd per share) | $ / shares					$ 84.96
Number of shares underlying warrants | shares					800,000
Amortization of Debt Issuance Costs		$ 0	$ 200,000
Convertible Notes, Due 2018 | Convertible Debt | Liability Component
Debt Instrument
Debt instrument face amount		170,900,000
Convertible Notes, Due 2018 | Convertible Debt | Equity Component
Debt Instrument
Debt instrument face amount		$ 79,100,000
Convertible Notes, Due 2018 | Convertible Debt | Liability Component
Debt Instrument
Debt extinguished	189,000,000
Convertible Notes, Due 2018 | Convertible Debt | Equity Component
Debt Instrument
Debt extinguished	$ 5,800,000

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