Debt and Credit Arrangements Convertible Notes (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 84.96
Interest accretion of convertible notes discount	$ 2,799,000	$ 2,587,000
Financing costs amortization	326,000us-gaap_AmortizationOfFinancingCosts	326,000us-gaap_AmortizationOfFinancingCosts
Convertible Notes, Due 2018 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Debt Instrument, Convertible, Effective Interest Rate	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	206,898,000		204,099,000
Unamortized discount	43,102,000		45,901,000
Debt Instrument, Convertible, Interest Expense	4,049,000	3,837,000
Interest Expense, Debt, Excluding Amortization	1,250,000	1,250,000
Interest accretion of convertible notes discount	2,799,000	2,587,000
Deferred Finance Costs, Gross	7,277,000
Financing costs amortization	178,000	178,000
Debt Instrument, Convertible, Threshold Consecutive Trading Days	20 days
Debt Instrument, Convertible, Threshold Trading Days	30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Debt Instrument, Convertible, Conversion Price	$ 69.03
Maximum Days After Any Five Trading Day Period In Which Trading Price Was Less Than 97 Percent Of Last Reported Sale Price of Common Stock Times Conversion Rate	5 days
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, Fair Value Disclosure, Narrative	The fair value of the Convertible Notes was approximately 97% of their par value as of March 31, 2015 and approximately 95% of their par value as of December 31, 2014.
Liability Component [Member] \| Convertible Notes, Due 2018 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	170,885,000
Deferred Finance Costs, Gross	4,974,000
Equity Component [Member] \| Convertible Notes, Due 2018 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	79,115,000
Deferred Finance Costs, Gross	$ 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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Net Cost Of Convertible Note Hedge And All Capped Transactions

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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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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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For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

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

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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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