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Long-Term Debt (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 29, 2014 | Mar. 30, 2013 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 361,948 |  | $ 364,911
Exchangeable unsecured notes, due 2102 | 38,642 |  | 38,642
Credit facility | 110,000 |  | 114,000
Less current portion | 0 |  | 0
Long-term debt, less current portion | 361,948 |  | 364,911
Debt Instruments [Abstract] |  |  |
Principal amount of debt | 575,000 |  | 575,000
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the debentures | 575,000 |  | 575,000
Unamortized discount | (362,810) |  | (363,768)
Embedded derivative | 1,116 |  | 1,037
Carrying value of liability component | 213,306 |  | 212,269
Equity component - net carrying value | 230,214 |  | 230,214
Interest expense related to debentures [Abstract] |  |  |
Contractual coupon interest | 3,235 | 3,235 |
Non-cash amortization of debt discount | 958 | 886 |
Non-cash amortization of deferred financing costs | 46 | 47 |
Non-cash change in value of derivative liability | 79 | (308) |
Total interest expense related to the debentures | 4,318 | 3,860 |
Convertible Senior Debentures 2040 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Convertible Debt, Noncurrent | 102,367 |  | 101,846
Debt Instruments [Abstract] |  |  |
Issuance date | Nov. 09, 2010 |  |
Debt maturity date | Nov. 15, 2040 |  |
Principal amount of debt | 275,000 |  | 275,000
Stated rate of interest on debt (in hundredths) | 2.25% |  |
Effective rate of interest on convertible senior debentures (in hundredths) | 8.00% |  |
Debt Instrument, Convertible, Stock Price Trigger | $ 17.97 |  |
Debt conversion rate | 72.3396 |  |
Debt effective conversion price | $ 13.82 |  |
Convertible senior debentures call date | Nov. 20, 2020 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the debentures | 275,000 |  | 275,000
Unamortized discount | (173,169) |  | (173,645)
Embedded derivative | 536 |  | 491
Carrying value of liability component | 102,367 |  | 101,846
Equity component - net carrying value | 110,094 |  | 110,094
Interest expense related to debentures [Abstract] |  |  |
Contractual coupon interest | 1,547 | 1,547 |
Non-cash amortization of debt discount | 476 | 440 |
Non-cash amortization of deferred financing costs | 22 | 22 |
Non-cash change in value of derivative liability | 45 | (147) |
Total interest expense related to the debentures | 2,090 | 1,862 |
Convertible Senior Debentures 2041 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Convertible Debt, Noncurrent | 52,519 |  | 52,264
Debt Instruments [Abstract] |  |  |
Issuance date | May 13, 2011 |  |
Debt maturity date | May 15, 2041 |  |
Principal amount of debt | 150,000 |  | 150,000
Stated rate of interest on debt (in hundredths) | 2.25% |  |
Effective rate of interest on convertible senior debentures (in hundredths) | 8.375% |  |
Debt Instrument, Convertible, Stock Price Trigger | $ 24.62 |  |
Debt conversion rate | 52.7896 |  |
Debt effective conversion price | $ 18.94 |  |
Convertible senior debentures call date | May 20, 2021 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the debentures | 150,000 |  | 150,000
Unamortized discount | (97,844) |  | (98,085)
Embedded derivative | 363 |  | 349
Carrying value of liability component | 52,519 |  | 52,264
Equity component - net carrying value | 62,246 |  | 62,246
Interest expense related to debentures [Abstract] |  |  |
Contractual coupon interest | 844 | 844 |
Non-cash amortization of debt discount | 241 | 222 |
Non-cash amortization of deferred financing costs | 11 | 12 |
Non-cash change in value of derivative liability | 14 | (88) |
Total interest expense related to the debentures | 1,110 | 990 |
Convertible Senior Debentures 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Convertible Debt, Noncurrent | 58,420 |  | 58,159
Debt Instruments [Abstract] |  |  |
Issuance date | May 31, 2012 |  |
Debt maturity date | Jun. 01, 2042 |  |
Principal amount of debt | 150,000 |  | 150,000
Stated rate of interest on debt (in hundredths) | 2.25% |  |
Effective rate of interest on convertible senior debentures (in hundredths) | 7.50% |  |
Debt Instrument, Convertible, Stock Price Trigger | $ 15.29 |  |
Debt conversion rate | 85.0541 |  |
Debt effective conversion price | $ 11.76 |  |
Convertible senior debentures call date | Jun. 07, 2022 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |
Principal amount of the debentures | 150,000 |  | 150,000
Unamortized discount | (91,797) |  | (92,038)
Embedded derivative | 217 |  | 197
Carrying value of liability component | 58,420 |  | 58,159
Equity component - net carrying value | 57,874 |  | 57,874
Interest expense related to debentures [Abstract] |  |  |
Contractual coupon interest | 844 | 844 |
Non-cash amortization of debt discount | 241 | 224 |
Non-cash amortization of deferred financing costs | 13 | 13 |
Non-cash change in value of derivative liability | 20 | (73) |
Total interest expense related to the debentures | $ 1,118 | $ 1,008 |

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 + Details
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Balance Type: | credit
Period Type: | instant

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