Borrowings Components of long-term debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Revolving credit facility, at a rate of 1.92% at March 29, 2015, due 2018	$ 200,000us-gaap_LineOfCredit	$ 200,000us-gaap_LineOfCredit
Total borrowings	1,134,546us-gaap_DebtInstrumentCarryingAmount	1,104,598us-gaap_DebtInstrumentCarryingAmount
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017	(32,981)	(36,197)
Total long-term debt	1,101,565us-gaap_LongTermDebt	1,068,401us-gaap_LongTermDebt
Current borrowings	(401,565)us-gaap_LongTermDebtCurrent	(368,401)us-gaap_LongTermDebtCurrent
Long-term borrowings	700,000us-gaap_LongTermDebtNoncurrent	700,000us-gaap_LongTermDebtNoncurrent
3.875% Convertible Senior Subordinated Notes
Debt Instrument [Line Items]
3.875% Convertible Senior Subordinated Notes due 2017	399,846	399,898
6.875% Senior Subordinated Notes due 2019
Debt Instrument [Line Items]
6.875% Senior Subordinated Notes due 2019	250,000	250,000
5.25% Senior Subordinated Notes Due 2024
Debt Instrument [Line Items]
5.25% Senior Notes due 2024	250,000	250,000
Securitization Program
Debt Instrument [Line Items]
Securitization program, at a rate of 0.93% at March 29, 2015	$ 34,700	$ 4,700

Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The carrying value as of the balance sheet date of the current and noncurrent portions 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.

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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.

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Amount of long-term debt, after 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.

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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.

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Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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