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Debt and Credit Arrangements Convertible Notes (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Interest accretion of convertible notes discount | $ 3,029,000 | $ 2,799,000 |
Financing costs amortization | 321,000 | 326,000 |
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, 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 | 218,663,000 |  | $ 215,634,000
Unamortized discount | 31,337,000 |  | $ 34,366,000
Debt Instrument, Convertible, Interest Expense | 4,279,000 | 4,049,000 |
Interest Expense, Debt, Excluding Amortization | 1,250,000 | 1,250,000 |
Interest accretion of convertible notes discount | 3,029,000 | 2,799,000 |
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 88% of their par value as of March 31, 2016 and December 31, 2015. |  |
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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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