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Debt And Credit Arrangements Convertible Notes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 84.96 |  |
Interest accretion of convertible notes discount | $ 11,535,000 | $ 10,662,000 | $ 9,854,000
Amortization of Financing Costs | 1,290,000 | 1,392,000 | 1,306,000
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, 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 | 215,634,000 | 204,099,000 |
Debt Instrument, Unamortized Discount | 34,366,000 | 45,901,000 |
Interest Expense, Debt | 16,535,000 | 15,662,000 | 14,854,000
Interest Expense, Debt, Excluding Amortization | 5,000,000 | 5,000,000 | 5,000,000
Interest accretion of convertible notes discount | 11,535,000 | 10,662,000 | 9,854,000
Debt Issuance Cost | 7,277,000 |  |
Amortization of Financing Costs | $ 711,000 | $ 711,000 | $ 711,000
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 | 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 88% of their par value as of December 31, 2015 and approximately 95% of their par value as of December 31, 2014. 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 11. |  |
Liability Component [Member] | Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 170,885,000 |  |
Debt Issuance Cost | 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 |  |
Debt Issuance Cost | $ 2,303,000 |  |

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