Debt And Credit Arrangements Convertible Notes (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 84.96
Current convertible notes	$ 0us-gaap_ConvertibleDebtCurrent	$ 193,437,000us-gaap_ConvertibleDebtCurrent
Interest accretion of convertible notes discount	10,662,000	9,854,000	9,109,000
Amortization of Financing Costs	1,392,000us-gaap_AmortizationOfFinancingCosts	1,306,000us-gaap_AmortizationOfFinancingCosts	1,530,000us-gaap_AmortizationOfFinancingCosts
Convertible Debt [Member] \| Convertible Notes, Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Debt Instrument, Interest Rate, Effective Percentage	7.90%
Number Of Shares Of Convertible Debt Hedged And Capped Call	3,622
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 84.96
Proceeds from Issuance of Warrants	48,848,000
Net Cost Of Convertible Note Hedge And All Capped Transactions	17,638,000
Convertible Debt, Noncurrent	204,099,000
Current convertible notes		193,437,000
Debt Instrument, Unamortized Discount	45,901,000	56,563,000
Interest Expense, Debt	15,662,000	14,854,000	14,109,000
Interest accretion of convertible notes discount	10,662,000	9,854,000	9,109,000
Debt Issuance Cost	7,277,000
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Debt Instrument, Convertible, Conversion Price	$ 69.03
Convertible Notes Principal Amount Denominator For Trading Price	1,000
Maximum Allowable Percentage Of The Product Of Last Reported Sale Price of Common Stock And Conversion Rate For Convertible Notes Payable	97.00%
Percent Of The Principal Amount Of The Convertible Notes Plus Accrued Interest To Be Purchased By The Company Subject Company Undergoing A Fundamental Change	100.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days	20 days
Debt Instrument, Convertible, Threshold Trading Days	30
Maximum days after any five trading day period in which trading price was less than 97 percent of last reported sale price	5 days
Debt Instrument, Fair Value Disclosure, Narrative	The fair value of the Convertible Notes was approximately 95% of their par value as of December 31, 2014 and approximately 154% of their par value as of December 31, 2013. The Convertible Notes are actively quoted instruments and, accordingly, the fair value of the Convertible Notes was determined using Level 1 inputs as defined in Note 10.
Interest Expense, Debt, Excluding Amortization	5,000,000	5,000,000	5,000,000
Amortization of Financing Costs	711,000	711,000	711,000
Convertible Debt [Member] \| Convertible Notes, Due 2018 [Member] \| Liability Component [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	170,885,000
Debt Issuance Cost	4,974,000
Convertible Debt [Member] \| Convertible Notes, Due 2018 [Member] \| Equity Component [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	79,115,000
Debt Issuance Cost	$ 2,303,000

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Debt Instrument, Fair Value Disclosure, Narrative

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Maximum Allowable Percentage Of The Product Of Last Reported Sale Price of Common Stock And Conversion Rate For Convertible Notes Payable

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Maximum days after any five trading day period in which trading price was less than 97 percent of last reported sale price

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Number Of Shares Of Convertible Debt Hedged And Capped Call

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Percent Of The Principal Amount Of The Convertible Notes Plus Accrued Interest To Be Purchased By The Company Subject Company Undergoing A Fundamental Change

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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 noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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

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The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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

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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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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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

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