Equivalent Shares Of Common Stock Per 1000 Principal Amount Of Convertible Notes

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- Definition

Net Cost Of Convertible Note Hedge And Warrants

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Number of Shares Underlying Warrants

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- Definition

Payments For Call Options Related to Convertible Debt

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- Definition

Premium Percentage On Shares Issued from Conversion of Convertible Debt

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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- Definition

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

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Debt And Credit Arrangements 2024 Notes (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2017	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Interest Paid	$ 9,300	$ 5,600	$ 5,100
Debt Instrument, Face Amount	$ 250,000
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Share Price			$ 17.96		$ 34.20	$ 95.64
Amortization of Debt Discount (Premium)	$ 12,800	12,500	$ 11,500
Amortization of Debt Issuance Costs	1,279	1,284	1,290
Payments For Call Options Related to Convertible Debt	59,500	0	0
Proceeds from Issuance of Warrants	46,000	0	$ 0
Convertible Notes, due 2024 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 258,800	$ 0
Debt Instrument, Interest Rate, Stated Percentage	1.00%
Equivalent Shares Of Common Stock Per 1000 Principal Amount Of Convertible Notes	17.0285
Debt Instrument, Convertible, Conversion Price	$ 58.73
Premium Percentage On Shares Issued from Conversion of Convertible Debt	35.00%
Share Price				$ 43.50
Debt Instrument, Interest Rate, Effective Percentage	4.80%
Amortization of Debt Discount (Premium)	$ 1,100
Interest Expense, Debt, Excluding Amortization	400
Interest Expense, Debt	1,500
Amortization of Debt Issuance Costs	100
Payments For Call Options Related to Convertible Debt	$ 59,500
Number of Shares Underlying Warrants	4,400,000
Proceeds from Issuance of Warrants	$ 46,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 71.775
Net Cost of Convertible Note Hedge and Warrants	$ 13,500
Liability Component [Member] \| Convertible Notes, due 2024 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	200,100
Debt Issuance Costs, Gross	5,200
Equity Component [Member] \| Convertible Notes, due 2024 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	58,700
Debt Issuance Costs, Gross	$ 1,500