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Debt and Credit Arrangements Convertible Notes (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  | $ 1,836,000
Interest accretion of convertible notes discount |  |  | $ 6,118,000 | $ 5,654,000 |
Financing costs amortization | $ 321,000 | $ 321,000 | 642,000 | 647,000 |
Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 250,000,000 |  | $ 250,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.00% |  | 2.00% |  |
Debt Instrument, Convertible, Effective Interest Rate | 7.90% |  | 7.90% |  |
Number Of Shares Of Convertible Debt Hedged And Capped Call | 3,622 |  | 3,622 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 84.96 |  | $ 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 | $ 221,752,000 |  | 221,752,000 |  | 215,634,000
Unamortized Debt Issuance Expense | 1,481,000 |  | 1,481,000 |  | 1,836,000
Unamortized discount | 28,248,000 |  | 28,248,000 |  | $ 34,366,000
Debt Instrument, Convertible, Interest Expense | 4,339,000 | 4,105,000 | 8,618,000 | 8,154,000 |
Interest Expense, Debt, Excluding Amortization | 1,250,000 | 1,250,000 | 2,500,000 | 2,500,000 |
Interest accretion of convertible notes discount | 3,089,000 | 2,855,000 | 6,118,000 | 5,654,000 |
Deferred Finance Costs, Gross | 7,277,000 |  | 7,277,000 |  |
Financing costs amortization | $ 178,000 | $ 178,000 | $ 355,000 | $ 356,000 |
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 |  | $ 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 |  | $ 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% |  | 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% |  | 100.00% |  |
Debt Instrument, Fair Value Disclosure, Narrative |  |  | The fair value of the Convertible Notes was approximately 94% and 88% of their par value as of June 30, 2016 and December 31, 2015, respectively. |  |
Liability Component [Member] | Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 170,885,000 |  | $ 170,885,000 |  |
Deferred Finance Costs, Gross | 4,974,000 |  | 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 |  | 79,115,000 |  |
Deferred Finance Costs, Gross | $ 2,303,000 |  | $ 2,303,000 |  |

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