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Long-Term Debt (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 30, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 394,509 |  | $ 392,931
Less current portion | 0 |  | 0
Long-term debt, less current portion | 394,509 |  | 392,931
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 | (366,528) |  | (367,414)
Embedded derivative | 995 |  | 1,303
Carrying value of liability component | 209,467 |  | 208,889
Equity component - net carrying value | 230,214 |  | 230,214
Interest expense related to debentures [Abstract] |  |  |
Contractual coupon interest | 3,235 | 2,391 |
Non-cash amortization of debt discount | 886 | 611 |
Non-cash amortization of deferred financing costs | 47 | 34 |
Non-cash change in value of derivative liability | (308) | (179) |
Total interest expense related to the debentures | 3,860 | 2,857 |
Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 90,000 |  | 89,000
Exchangeable Unsecured Notes, Due 2102 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 95,042 |  | 95,042
Convertible Senior Debentures, Due 2040 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 100,459 |  | 100,166
Debt Instruments [Abstract] |  |  |
Convertible senior debentures 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 Conversion Price Amount | $ 13.88 |  |
Debt instrument, conversion trigger | $ 18.04 |  |
Debt instrument, initial conversion shares of common stock (shares per $1000 principal) | 72.0331 |  |
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 | (175,016) |  | (175,456)
Embedded derivative | 475 |  | 622
Carrying value of liability component | 100,459 |  | 100,166
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 | 440 | 407 |
Non-cash amortization of deferred financing costs | 22 | 22 |
Non-cash change in value of derivative liability | (147) | (104) |
Total interest expense related to the debentures | 1,862 | 1,872 |
Convertible Senior Debentures, Due 2041 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 51,533 |  | 51,399
Debt Instruments [Abstract] |  |  |
Convertible senior debentures 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 Conversion Price Amount | $ 19.02 |  |
Debt instrument, conversion trigger | $ 24.73 |  |
Debt instrument, initial conversion shares of common stock (shares per $1000 principal) | 52.5659 |  |
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 | (98,778) |  | (99,000)
Embedded derivative | 311 |  | 399
Carrying value of liability component | 51,533 |  | 51,399
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 | 222 | 204 |
Non-cash amortization of deferred financing costs | 12 | 12 |
Non-cash change in value of derivative liability | (88) | (75) |
Total interest expense related to the debentures | 990 | 985 |
Convertible Senior Debentures 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 57,475 |  | 57,324
Debt Instruments [Abstract] |  |  |
Convertible senior debentures 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 Conversion Price Amount | $ 11.81 |  |
Debt instrument, conversion trigger | $ 15.35 |  |
Debt instrument, initial conversion shares of common stock (shares per $1000 principal) | 84.6937 |  |
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 | (92,734) |  | (92,958)
Embedded derivative | 209 |  | 282
Carrying value of liability component | 57,475 |  | 57,324
Equity component - net carrying value | 57,874 |  | 57,874
Interest expense related to debentures [Abstract] |  |  |
Contractual coupon interest | 844 |  |
Non-cash amortization of debt discount | 224 |  |
Non-cash amortization of deferred financing costs | 13 |  |
Non-cash change in value of derivative liability | (73) |  |
Total interest expense related to the debentures | $ 1,008 |  |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. 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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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