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v3.7.0.1

Long-Term Debt (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2017 USD ($) $ / shares | Jul. 02, 2016 USD ($) | Jul. 01, 2017 USD ($) $ / shares | Jul. 02, 2016 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Credit facility | $ 133,000 |  | $ 133,000 |  | $ 143,000
Deferred Financing Costs | (9,990) |  | (9,990) |  | (10,880)
Long-term debt | 350,329 |  | 350,329 |  | 357,023
Less current portion | 0 |  | 0 |  | 0
Long-term debt, less current portion | 350,329 |  | 350,329 |  | 357,023
Debt Instruments [Abstract] |  |  |  |  |
Principal amount of debt | $ 575,000 |  | $ 575,000 |  | 575,000
Debt instrument percentage of conversion price (in hundredths) |  |  | 130.00% |  |
Debt instrument, Percentage of sale price of common stock (in hundredths) | 98.00% |  | 98.00% |  |
Principal payments on long-term debt and capital leases |  |  | $ 0 | $ (34,044) |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of the debentures | $ 575,000 |  | 575,000 |  | 575,000
Unamortized discount | (348,507) |  | (348,507) |  | (350,951)
Embedded derivative | 826 |  | 826 |  | 854
Carrying value of liability component | 227,319 |  | 227,319 |  | 224,903
Equity component - net carrying value | 230,214 |  | 230,214 |  | 230,214
Interest expense related to debentures [Abstract] |  |  |  |  |
Contractual coupon interest | 3,235 | $ 3,235 | 6,470 | 6,470 |
Non-cash amortization of debt discount | 1,233 | 1,139 | 2,444 | 2,259 |
Non-cash amortization of deferred financing costs | 48 | 49 | 95 | 95 |
Non-cash change in value of derivative liability | (1) | (127) | (28) | (100) |
Total interest expense related to the debentures | 4,515 | 4,296 | 8,981 | 8,724 |
Convertible Senior Debentures, Due 2040 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible Debt, Noncurrent | 109,291 |  | $ 109,291 |  | 108,120
Debt Instruments [Abstract] |  |  |  |  |
Issuance date |  |  | Nov. 09, 2010 |  |
Debt maturity date |  |  | 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% |  | 8.00% |  |
Debt conversion rate | 76.6985 |  |  |  |
Debt effective conversion price | $ / shares | $ 13.04 |  | $ 13.04 |  |
Debt Instrument, Convertible, Stock Price Trigger | $ / shares |  |  | $ 16.95 |  |
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 |  | 275,000
Unamortized discount | (166,058) |  | (166,058) |  | (167,273)
Embedded derivative | 349 |  | 349 |  | 393
Carrying value of liability component | 109,291 |  | 109,291 |  | 108,120
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 | 613 | 567 | 1,215 | 1,123 |
Non-cash amortization of deferred financing costs | 22 | 22 | 44 | 44 |
Non-cash change in value of derivative liability | (19) | (41) | (44) | (35) |
Total interest expense related to the debentures | 2,163 | 2,095 | 4,309 | 4,226 |
Convertible Senior Debentures, Due 2041 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible Debt, Noncurrent | 56,072 |  | $ 56,072 |  | 55,442
Debt Instruments [Abstract] |  |  |  |  |
Issuance date |  |  | May 13, 2011 |  |
Debt maturity date |  |  | 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% |  | 8.375% |  |
Debt conversion rate | 55.9705 |  |  |  |
Debt effective conversion price | $ / shares | $ 17.87 |  | $ 17.87 |  |
Debt Instrument, Convertible, Stock Price Trigger | $ / shares |  |  | $ 23.23 |  |
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 |  | 150,000
Unamortized discount | (94,221) |  | (94,221) |  | (94,843)
Embedded derivative | 293 |  | 293 |  | 285
Carrying value of liability component | 56,072 |  | 56,072 |  | 55,442
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 | 314 | 289 | 622 | 573 |
Non-cash amortization of deferred financing costs | 12 | 13 | 24 | 24 |
Non-cash change in value of derivative liability | 6 | (72) | 8 | (34) |
Total interest expense related to the debentures | 1,176 | 1,074 | 2,342 | 2,251 |
Convertible Senior Debentures, Due 2042 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible Debt, Noncurrent | 61,956 |  | $ 61,956 |  | 61,341
Debt Instruments [Abstract] |  |  |  |  |
Issuance date |  |  | May 31, 2012 |  |
Debt maturity date |  |  | 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% |  | 7.50% |  |
Debt conversion rate | 90.1791 |  |  |  |
Debt effective conversion price | $ / shares | $ 11.09 |  | $ 11.09 |  |
Debt Instrument, Convertible, Stock Price Trigger | $ / shares |  |  | $ 14.42 |  |
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 |  | 150,000
Unamortized discount | (88,228) |  | (88,228) |  | (88,835)
Embedded derivative | 184 |  | 184 |  | 176
Carrying value of liability component | 61,956 |  | 61,956 |  | 61,341
Equity component - net carrying value | 57,874 |  | 57,874 |  | $ 57,874
Interest expense related to debentures [Abstract] |  |  |  |  |
Contractual coupon interest | 844 | 844 | 1,688 | 1,688 |
Non-cash amortization of debt discount | 306 | 283 | 607 | 563 |
Non-cash amortization of deferred financing costs | 14 | 14 | 27 | 27 |
Non-cash change in value of derivative liability | 12 | (14) | 8 | (31) |
Total interest expense related to the debentures | $ 1,176 | $ 1,127 | $ 2,330 | $ 2,247 |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. 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 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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 210.5-02.22) -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 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 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 3: 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 Reference 4: 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 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Floor percentage of the trading price of convertible debt instruments to the product of common stock price and conversion rate to determine eligibility of conversion. + References No definition available. + Details
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