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Financial Commitments (Summary Of Information Related To The Liability And Equity Components Of The Convertible Notes) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Deferred taxes | $ (108,440,000) | $ (129,661,000)
Convertible Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal | 200,000,000 |
Liability Component [Member] | Convertible Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal | 200,000,000 | 200,000,000
Conversion feature | (46,800,000) | (46,800,000)
Allocated debt issuance costs | (5,051,000) | (5,051,000)
Amortization of discount and debt issuance costs (non-cash interest expense) | 13,486,000 | 4,519,000
Net carrying amount | 161,635,000 | 152,668,000
Equity Component [Member] | Convertible Notes [Member] |  |
Debt Instrument [Line Items] |  |
Conversion feature | 46,800,000 | 46,800,000
Allocated debt issuance costs | (1,543,000) | (1,543,000)
Deferred taxes | (18,815,000) | (18,815,000)
Net carrying amount | $ 26,442,000 | $ 26,442,000

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 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=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(8)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + 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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