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Debt And Credit Arrangements 2018 Notes (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 05, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 250,000 | $ 250,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.00% | 2.00% |  |  |  |
Debt Instrument, Repurchase Amount |  | $ 192,900 | $ 192,900 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | [1] | 60,900 | 60,900 |  |  |  |
Loss on extinguishment of debt |  | 4,900 | 4,900 |  | $ 0 | $ 0 |
Interest Paid |  |  | 9,300 |  | 5,600 | 5,100 |
Interest accretion of convertible notes discount |  |  | 12,800 |  | 12,500 | 11,500 |
Amortization of Debt Issuance Costs |  |  | 1,279 |  | 1,284 | 1,290 |
Convertible Notes, Due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  | 57,100 | 57,100 |  |  |  |
Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 57,100 | $ 57,100 |  | 250,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.00% | 2.00% |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 7.90% | 7.90% |  |  |  |
Repayments of Debt |  |  | $ 195,900 |  |  |  |
Debt Instrument, Repurchase Amount |  | $ 192,900 | 192,900 |  |  |  |
Interest on Convertible Debt, Net of Tax |  |  | 1,000 |  |  |  |
Extinguishment of Debt, Amount |  |  | 194,900 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  | 57,100 | 57,100 |  |  |  |
Convertible Debt, Current |  | $ 55,100 | $ 55,100 |  |  |  |
Fair Value Inputs, Discount Rate |  |  | 4.80% |  |  |  |
Convertible Debt |  |  |  |  | 227,000 |  | $ 184,700
Loss on extinguishment of debt |  |  | $ 4,700 | [2] | 0 | 0 |
Interest Paid |  |  | $ 1,000 |  |  |  |
Equivalent Shares Of Common Stock Per 1000 Principal Amount Of Convertible Notes | shares |  |  | 14.4865 |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  | $ 69.03 | $ 69.03 |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days |  |  | 20 |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days |  |  | 30 |  |  |  |
Interest accretion of convertible notes discount |  |  | $ 11,800 |  | 12,500 | 11,500 |
Interest Expense, Debt, Excluding Amortization |  |  | 4,300 |  | 5,000 | 5,000 |
Interest Expense, Debt |  |  | 16,100 |  | 17,500 | 16,500 |
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost |  |  | 4,300 |  | 0 | 0 |
Write off of Deferred Debt Issuance Cost |  |  | 400 |  | 0 | 0 |
Amortization of Debt Issuance Costs |  |  | $ 619 |  | $ 711 | $ 711 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 84.96 | $ 84.96 |  |  |  |
Number of Shares Underlying Warrants | shares |  | 800,000 | 800,000 |  |  |  |
Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] | Liability Component [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 189,000 |  |  |  |
Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] | Equity Component [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | 5,800 |  |  |  |
Liability Component [Member] | Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 170,900 | 170,900 |  |  |  |
Equity Component [Member] | Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 79,100 | $ 79,100 |  |  |  |
[1] | (1) Includes the $57.1 fully accreted amount of our 2018 Notes and $3.8 current maturities related to foreign facilities.
[2] | (1) During the year ended December 31, 2017, we wrote off $0.2 of unamortized debt issuance costs related to our senior secured revolving credit facility. When combined with the total loss on extinguishment associated with the 2018 Notes, consolidated loss on extinguishment is $4.9.

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