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Long-Term Debt (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 405,392 |  | $ 405,392 |  | $ 392,931
Less current portion | 0 |  | 0 |  | 0
Long-term debt, less current portion | 405,392 |  | 405,392 |  | 392,931
Debt Instruments [Abstract] |  |  |  |  |
Principal amount of debt | 575,000 |  | 575,000 |  | 575,000
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of the debentures | 575,000 |  | 575,000 |  | 575,000
Unamortized discount | (365,627) |  | (365,627) |  | (367,414)
Embedded derivative | 977 |  | 977 |  | 1,303
Carrying value of liability component | 210,350 |  | 210,350 |  | 208,889
Equity component - net carrying value | 230,214 |  | 230,214 |  | 230,214
Interest expense related to debentures [Abstract] |  |  |  |  |
Contractual coupon interest | 3,235 | 2,682 | 6,470 | 5,073 |
Non-cash amortization of debt discount | 901 | 697 | 1,787 | 1,308 |
Non-cash amortization of deferred financing costs | 48 | 39 | 95 | 73 |
Non-cash change in value of derivative liability | (18) | 222 | (326) | 43 |
Total interest expense related to the debentures | 4,166 | 3,640 | 8,026 | 6,497 |
Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 100,000 |  | 100,000 |  | 89,000
Exchangeable Unsecured Notes, Due 2102 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 95,042 |  | 95,042 |  | 95,042
Convertible Senior Debentures, Due 2040 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 100,891 |  | 100,891 |  | 100,166
Debt Instruments [Abstract] |  |  |  |  |
Convertible senior debentures issuance date |  |  | Nov. 09, 2010 |  |
Debt maturity date | Nov. 15, 2040 |  | Nov. 15, 2040 |  |
Principal amount of debt | 275,000 |  | 275,000 |  | 275,000
Stated rate of interest on debt (in hundredths) | 2.25% |  | 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 |  | $ 18.04 |  |
Debt instrument, initial conversion shares of common stock (shares per $1000 principal) |  |  | 72.0331 |  |
Convertible senior debentures call date | Nov. 20, 2020 |  | Nov. 20, 2020 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of the debentures | 275,000 |  | 275,000 |  | 275,000
Unamortized discount | (174,568) |  | (174,568) |  | (175,456)
Embedded derivative | 459 |  | 459 |  | 622
Carrying value of liability component | 100,891 |  | 100,891 |  | 100,166
Equity component - net carrying value | 110,094 |  | 110,094 |  | 110,094
Interest expense related to debentures [Abstract] |  |  |  |  |
Contractual coupon interest | 1,547 | 1,547 | 3,094 | 3,094 |
Non-cash amortization of debt discount | 448 | 414 | 888 | 821 |
Non-cash amortization of deferred financing costs | 22 | 22 | 44 | 44 |
Non-cash change in value of derivative liability | (16) | 71 | (163) | (33) |
Total interest expense related to the debentures | 2,001 | 2,054 | 3,863 | 3,926 |
Convertible Senior Debentures, Due 2041 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 51,760 |  | 51,760 |  | 51,399
Debt Instruments [Abstract] |  |  |  |  |
Convertible senior debentures issuance date |  |  | May 13, 2011 |  |
Debt maturity date | May 15, 2041 |  | May 15, 2041 |  |
Principal amount of debt | 150,000 |  | 150,000 |  | 150,000
Stated rate of interest on debt (in hundredths) | 2.25% |  | 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 |  | $ 24.73 |  |
Debt instrument, initial conversion shares of common stock (shares per $1000 principal) |  |  | 52.5659 |  |
Convertible senior debentures call date | May 20, 2021 |  | May 20, 2021 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of the debentures | 150,000 |  | 150,000 |  | 150,000
Unamortized discount | (98,552) |  | (98,552) |  | (99,000)
Embedded derivative | 312 |  | 312 |  | 399
Carrying value of liability component | 51,760 |  | 51,760 |  | 51,399
Equity component - net carrying value | 62,246 |  | 62,246 |  | 62,246
Interest expense related to debentures [Abstract] |  |  |  |  |
Contractual coupon interest | 844 | 844 | 1,688 | 1,688 |
Non-cash amortization of debt discount | 226 | 209 | 448 | 413 |
Non-cash amortization of deferred financing costs | 12 | 12 | 24 | 24 |
Non-cash change in value of derivative liability | 1 | 109 | (87) | 34 |
Total interest expense related to the debentures | 1,083 | 1,174 | 2,073 | 2,159 |
Convertible Senior Debentures, Due 2042 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 57,699 |  | 57,699 |  | 57,324
Debt Instruments [Abstract] |  |  |  |  |
Convertible senior debentures issuance date |  |  | May 31, 2012 |  |
Debt maturity date | Jun. 01, 2042 |  | Jun. 01, 2042 |  |
Principal amount of debt | 150,000 |  | 150,000 |  | 150,000
Stated rate of interest on debt (in hundredths) | 2.25% |  | 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 |  | $ 15.35 |  |
Debt instrument, initial conversion shares of common stock (shares per $1000 principal) |  |  | 84.6937 |  |
Convertible senior debentures call date | Jun. 07, 2022 |  | Jun. 07, 2022 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of the debentures | 150,000 |  | 150,000 |  | 150,000
Unamortized discount | (92,507) |  | (92,507) |  | (92,958)
Embedded derivative | 206 |  | 206 |  | 282
Carrying value of liability component | 57,699 |  | 57,699 |  | 57,324
Equity component - net carrying value | 57,874 |  | 57,874 |  | 57,874
Interest expense related to debentures [Abstract] |  |  |  |  |
Contractual coupon interest | 844 | 291 | 1,688 | 291 |
Non-cash amortization of debt discount | 227 | 74 | 451 | 74 |
Non-cash amortization of deferred financing costs | 14 | 5 | 27 | 5 |
Non-cash change in value of derivative liability | (3) | 42 | (76) | 42 |
Total interest expense related to the debentures | $ 1,082 | $ 412 | $ 2,090 | $ 412 |

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