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Long-Term Debt (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 01, 2017
USD ($)
$ / shares
Apr. 02, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Credit facility $ 163,000   $ 143,000
Deferred Financing Costs (10,435)   (10,880)
Long-term debt 378,652   357,023
Less current portion 0   0
Long-term debt, less current portion 378,652   357,023
Debt Instruments [Abstract]      
Principal amount of debt $ 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%    
Principal payments on long-term debt and capital leases $ 0 $ (22,595)  
Liability and equity components of convertible debentures [Abstract]      
Principal amount of the debentures 575,000   575,000
Unamortized discount (349,740)   (350,951)
Embedded derivative 827   854
Carrying value of liability component 226,087   224,903
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 1,211 1,120  
Non-cash amortization of deferred financing costs 47 46  
Non-cash change in value of derivative liability (27) 27  
Total interest expense related to the debentures 4,466 4,428  
Convertible Senior Debentures, Due 2040 [Member]      
Debt Instrument [Line Items]      
Convertible Debt, Noncurrent $ 108,697   108,120
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 conversion rate 76.4157    
Debt effective conversion price | $ / shares $ 13.09    
Debt Instrument, Convertible, Stock Price Trigger | $ / shares $ 17.02    
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 (166,671)   (167,273)
Embedded derivative 368   393
Carrying value of liability component 108,697   108,120
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 602 556  
Non-cash amortization of deferred financing costs 22 22  
Non-cash change in value of derivative liability (25) 6  
Total interest expense related to the debentures 2,146 2,131  
Convertible Senior Debentures, Due 2041 [Member]      
Debt Instrument [Line Items]      
Convertible Debt, Noncurrent $ 55,752   55,442
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 conversion rate 55.7641    
Debt effective conversion price | $ / shares $ 17.93    
Debt Instrument, Convertible, Stock Price Trigger | $ / shares $ 23.31    
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 (94,535)   (94,843)
Embedded derivative 287   285
Carrying value of liability component 55,752   55,442
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 308 284  
Non-cash amortization of deferred financing costs 12 11  
Non-cash change in value of derivative liability 2 38  
Total interest expense related to the debentures 1,166 1,177  
Convertible Senior Debentures, Due 2042 [Member]      
Debt Instrument [Line Items]      
Convertible Debt, Noncurrent $ 61,638   61,341
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 conversion rate 89.8466    
Debt effective conversion price | $ / shares $ 11.13    
Debt Instrument, Convertible, Stock Price Trigger | $ / shares $ 14.47    
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 (88,534)   (88,835)
Embedded derivative 172   176
Carrying value of liability component 61,638   61,341
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 301 280  
Non-cash amortization of deferred financing costs 13 13  
Non-cash change in value of derivative liability (4) (17)  
Total interest expense related to the debentures $ 1,154 $ 1,120